**Steps to reproduce**
- Have user A with Sign admin rights and user B without Sign rights.
- With user A, create a sign request activity on a record that user B can access. Send the signature request.
- With user B, try to access the record. -> AccessError when trying to fetch the chatter.

**Cause**
By default, users get access to all the activities associated to records they have access to (see `_search` of `mail.activity`). This is an issue since some of the fields added in `_store_activity_fields` for the sign request activity display might not be accessible for a user with access to the activity.

**Change**
Use `sudo` to be able to display the activity, even if the user doesn't have access to the sign request.
Also, in that case, `can_write` should be `False` in order to hide the action buttons of the activity, which trigger access errors when trying to make operations on the sign request.

Another related change is to create the activity for the user creating the sign request, this avoids falling back on the `user_id` of the record associated with the activity and makes sure the activity's user has access to the sign request.

opw-6157455

Forward-Port-Of: odoo/enterprise#118555
Forward-Port-Of: odoo/enterprise#116540

Step to reproduce:
- install "pos_settle_due"
- create a pos order, set order price = 0, select a customer
- go to payment page, select "customer account" as payment method
- here you can set any amount to pay, ex 100$
- fulfill the  order.

Observation:
- the order amount is 0, if we pay 100$ using customer account, it is considered as change (which means we returned it to customer)
- As per PO, this flow doesn't make sense

Issue:
- customer has 100$ due for this order, but he won't be able to settle this as fetch order to settle with amount != 0, after commit [1] 
- [1] https://github.com/odoo/enterprise/commit/12af23d5382e972facfaa999e4c5ab30c97e8d1f

https://github.com/odoo/enterprise/blob/951e5f42884c898bc14d9c32ae6a8f08c31ff06d/pos_settle_due/static/src/app/screens/partner_list/partner_line/partner_line.js#L35

Fix:
- we hide payment method of type "pay_later" in case of 0 price order

opw-6123699

Forward-Port-Of: odoo/enterprise#118864
Forward-Port-Of: odoo/enterprise#116556

…lit for same-product lines

When doing an intercompany Sale->Purchase with multiple lines having the same products, the receipt picking would be incorrectly assigned:
- Enable Inter-Company Transactions on both companies (Create and validate)
- Create SO in company A to company B with 2 lines having the same product P, Confirm. => Delivery in company A, Purchase and Receipts in company will be created => The SO/PO/Delivery/Receipt will all have 2 lines
- Validate delivery => On the receipt, the 2 units of P are reserved on the 1st move, and the 2nd move is not reserved.


https://github.com/user-attachments/assets/b4816051-120e-4226-9228-fd552649d5ef


---

### Test result without fix:
```
2026-04-23 13:16:44,577 48027 INFO oes_test_18.0 odoo.addons.sale_purchase_stock_inter_company_rules.tests.test_inter_company_so_to_po: Starting TestInterCompanySaleToPurchaseWithStock.test_02_inter_company_multiple_lines_with_same_product ... 
2026-04-23 13:16:44,949 48027 INFO oes_test_18.0 odoo.addons.sale_purchase_stock_inter_company_rules.tests.test_inter_company_so_to_po: ====================================================================== 
2026-04-23 13:16:44,949 48027 ERROR oes_test_18.0 odoo.addons.sale_purchase_stock_inter_company_rules.tests.test_inter_company_so_to_po: FAIL: TestInterCompanySaleToPurchaseWithStock.test_02_inter_company_multiple_lines_with_same_product
Traceback (most recent call last):
  File "/home/odoo/Odoo/src/18.0/enterprise/sale_purchase_stock_inter_company_rules/tests/test_inter_company_so_to_po.py", line 109, in test_02_inter_company_multiple_lines_with_same_product
    self.assertRecordValues(purchase_from_a.picking_ids.move_ids, [
  File "/home/odoo/Odoo/src/18.0/odoo/odoo/tests/common.py", line 709, in assertRecordValues
    self.assertSequenceEqual(expected_reformatted, record_reformatted, seq_type=list)
AssertionError: Lists differ: [{'pr[18 chars]0, 'quantity': 1.0}, {'product_uom_qty': 1.0, 'quantity': 1.0}] != [{'pr[18 chars]0, 'quantity': 2.0}, {'product_uom_qty': 1.0, 'quantity': 0.0}]

First differing element 0:
{'product_uom_qty': 1.0, 'quantity': 1.0}
{'product_uom_qty': 1.0, 'quantity': 2.0}

- [{'product_uom_qty': 1.0, 'quantity': 1.0},
?                                       ^

+ [{'product_uom_qty': 1.0, 'quantity': 2.0},
?                                       ^

-  {'product_uom_qty': 1.0, 'quantity': 1.0}]
?                                       ^

+  {'product_uom_qty': 1.0, 'quantity': 0.0}]
?                                       ^

```

OPW-6145683

Forward-Port-Of: odoo/enterprise#118805
Forward-Port-Of: odoo/enterprise#114873

Several error are logged in the chatter when signing a payslip that includes an IMSS disability time off.

Steps to reproduce:
* Install l10n_mx_hr_payroll_account modules
* Switch to "INNOVACION VALOR Y DESARROLLO SA SA" company
* Go to Employees and open Cesar Osbaldo Cruz Solorzano
* Click on "Time Off" smart button and create a new time off with "Disability due to illness (IMSS)" type for "02/01/2026"(Any date).
* Go to Payroll > Payslips > Payslips and create a new pay run
* Select Salary Structure 'Mexico: Regular Pay', Pay Schedule 'Monthly' and the Period '01/01/2026 -> 01/31/2026'
* Click on Continue, select Cesar and click on Select
* Open the payslip, click on "Validate" and "Ok"
* Mark as paid, open the "Journal Entry" from the smart button and click on "Post".
* Back to the payslip, and click on "Generate CFDI" button.
* An error is added to the chatter.

### Missing node to declare disabilities
Original message
```py
An error occurred while signing the CFDI document with the government:
Code : NOM111 Message : Error no clasificado. Extra Info : El nodo
"Incapacidades" se debera informar si se incluye en percepciones la
clave 014 "Subsidios por Incapacidad" o bien en deducciones la clave 006
"Descuento por incapacidad".
```

Translated message
```py
An error occurred while signing the CFDI document with the government:
Code: NOM111 Message: Unclassified error. Extra Info: The "Incapacidades"
(Disabilities) node must be reported if the perception key 014
"Subsidios por Incapacidad" (Disability Subsidies) is included, or if
the deduction key 006 "Descuento por incapacidad" (Disability Deduction)
is included.
```

Legal Context:
According to Mexican law, IMSS disabilities must be declared in a specific XML node.

There are two primary scenarios for reporting these amounts:
* Deduction (Type 006): The employer does not pay for these days, as the IMSS is responsible for the payment to the employee.
  This is the most common scenario.

* Perception (Type 014): The employer pays for these days as a superior benefit. For example, by law, the IMSS does not pay for the first 3 days of a disability due to illness, and employers are not obligated to cover them either. However, companies offering superior benefits may choose to pay these days as a "Disability Subsidy."

Solution:
The chosen approach is to configure the Deduction node.
For the `l10n_mx_regular_pay_imss_disabilities` rule, the `l10n_mx_concept` has been set to `l10n_mx_concept_d6` (D06 - Disability Deduction). This ensures the required node is added.

### Missing "ImporteMonetario" attribute
Original message
```
An error occurred while signing the CFDI document with the government:
Code : NOM95 Message : El atributo Deduccion:Importe no es igual a la
suma de los nodos Incapacidad:ImporteMonetario, ya que la clave
expresada en Nomina.Deducciones.Deduccion.TipoDeduccion es "006".
```

Translated message
```
An error occurred while signing the CFDI document with the government:
Code: NOM95 Message: The attribute "Deduccion:Importe" does not match
the sum of the "Incapacidad:ImporteMonetario" nodes, as the key
expressed in "Nomina.Deducciones.Deduccion.TipoDeduccion" is "006".
```

Problem:
The "Incapacidades" node requires the "ImporteMonetario" attribute, which should represent the sum of the monetary value associated with the disabilities.

Solution:
Add the "ImporteMonetario" attribute and calculate its value using `l10n_mx_daily_salary`.

### Invalid "DiasIncapacidad" format
```py
An error occurred while signing the CFDI document with the government:
Code : 301 Message : XML mal formado Extra Info : Element
'{[http://www.sat.gob.mx/nomina12}Incapacidad](http://www.sat.gob.mx/nomina12%7DIncapacidad)', attribute
'DiasIncapacidad': '4.0' is not a valid value of the local atomic type.
```

Problem:
Altough the defaultdict where the values are sum up, `number_of_days` is
a float field, and when we get back the value, it is a float, adding for
example 4.0 instead of 4, which is not a valid value.

Solution:
Cast the value to int.

### Duplicate deduction on disabilities
```py
Wrong python code defined for:
- Employee: Cesar Osbaldo Cruz Solorzano
- Version: False
- Payslip: Salary Slip - Cesar Osbaldo Cruz Solorzano - 05/01/2026 - 05/15/2026
- Salary rule: ISR (Income Tax) (ISR)
- Error: TypeError('cannot unpack non-iterable NoneType object') while
evaluating
"
def find_rates(x, rates):
    for low, high, fix, rate in rates:
        if low <= x <= high:
            return low, high, fix, rate

gross = categories['GROSS']
result = 0
if gross:
    isr_table = payslip._rule_parameter('l10n_mx_isr_tables')[version.schedule_pay]
    low, high, fix, rate = find_rates(gross, isr_table)
    result = -((gross - low) * rate + fix)

period_factor = payslip._rule_parameter('l10n_mx_schedule_table')[version.schedule_pay]
if period_factor >= 15:
    period_factor = (period_factor / 30) * (365 / 12)
min_wage = payslip._rule_parameter('l10n_mx_daily_min_wage') * period_factor

if gross <= min_wage:
    result_qty = 0.0
"
```

Problem:
The IMSS disability amount is being deducted twice:
1. During "Worked Days" calculation, the IMSS disability is already not considered because the work entries belong to the "Unpaid Work Entry Types" of "Mexico: Regular Pay" structure.
2. During "Salary Computation", the `IMSS_DISABLE` salary rule deducts another time because it is in the `TAXABLE_ALW` category, and this one is deducted in the `NET` rule.

When the disability covers more than half of the period (e.g., 20 days in a monthly schedule), the double deduction causes the NET to become negative. This prevents the ISR rule from finding a correct stage in the tax tables, leading to a traceback.

Example: For a monthly wage of 30,000.0 and 5 disability days:
- The total amount in "Worked Days" is 25,000.0 (disabilities already deducted).
- The IMSS_DISABLE rule calculates -5,000.0, and when the NET rule is calculated, the disabilities are deducted again. Total NET becomes 16,843.84 instead of the expected 20,834.85.

Solution:
Change the rule category to `INTERMEDIARY_COMPUTATION` and avoid the double deduction when the `NET` is calculated, as it is already considered in the "Worked Days".

### Incorrect values in the XML
The signing process completes without errors, but some amounts in the generated XML are incorrect.

Problem:
The introduction of the Deduction 006 (Disability) directly impacts the calculation of the SubTotal and Total attributes in the Comprobante node.
For a monthly payslip with a wage of 30,000.00 (daily salary of 1,000.00) and 5 disability days (work risk), the values are calculated incorrectly as follows:
Attribute            | Calculation                      | Actual Value | Correct Value
---------------------|----------------------------------|--------------|--------------
Comprobante:SubTotal | Sum of Perceptions (P01)         | 25000.00     | 30000.00 (1)
Comprobante:Total    | SubTotal - Total Deductions (2)  | 15803.74     | 20803.74

(1) Must include the 5,000.00 from disabilities to balance the deduction.
(2) Total Deductions = D06 (5,000.00) + ISR (3,451.65) + IMSS (744.61) = 9,196.26.

The Total is currently undercalculated because the 5,000.00 is being
deducted from the SubTotal that already had those 5,000.00 excluded.

Solution:
Since the `SubTotal` is derived from Perceptions, and the "(P01)
Salaries, Wages, Stripes, and Day Labor" amount is driven by the
`GROSS_WITHOUT_HOLIDAY` rule, the disability amount must be added. This
balances the Deduction 006, ensuring `SubTotal` is correct.

### Absenteeism and Disabilities
By law, the calculation of IMSS contributions depends on these two types of unpaid days:
* Disabilities: Refers to medical leave issued by the Institute (IMSS).
* Absenteeism: Refers to unjustified leave; apply for periods of fewer than 8 days.

Source: [Artículo 31](https://www.imss.gob.mx/sites/all/statics/pdf/leyes/LSS.pdf)
Translated text:
Article 31. When wages are not paid due to the employee's absence from work, but the employment relationship persists, the monthly contribution shall be adjusted according to the following rules:

I. If the employee's absences are for periods of fewer than eight consecutive or non-consecutive days, contributions shall be calculated and paid for such periods only for the sickness and maternity insurance...
If the employee's absences are for periods of eight consecutive days or more, the employer shall be released from the payment of employer-employee contributions...

IV. In the case of absences covered by medical disabilities issued by the Institute, it shall not be mandatory to cover the employer-employee contributions, except regarding the retirement branch.

The following table summarizes the contribution requirements based on the type of absence:
Insurance Branch (RAMA)         | Section I (Absenteeism) | Section IV (Disability)
--------------------------------|-------------------------|------------------------
Sickness and Maternity          | Paid                    | Not Paid
Disability and Life             | Not Paid                | Not Paid
Severance and Old Age           | Not Paid                | Not Paid
Work Risk                       | Not Paid                | Not Paid
Daycare and Social Benefits     | Not Paid                | Not Paid
INFONAVIT                       | Not Paid                | Paid
Retirement                      | Not Paid                | Paid

The type of unpaid day to be considered depends on the specific insurance branch being calculated within the employer-employee contributions.

### Add test for cfdi with disabilities.

target: 19.0
task-6066160

Forward-Port-Of: odoo/enterprise#116819

Currently, an error occurs when a user opens a payslip.

**Steps to Reproduce:**
 - Install the `documents_hr_payroll` module.
 - Go to `Payroll` > `Payslips` > `Payslips` and open an `existing payslip` or `create a new one`.
 - Add `two or more attachments` to the payslip.
 - Go to `Documents` and, in the left panel, navigate to `Company` > `Employees - YourCompany` > 
   `Payroll YourCompany`, then `Move to Trash` all documents related to those `payslip attachments`.
 - Go back to `Payslips` and open the `same payslip` again.

`ValueError: Expected singleton: hr.payslip(4, 4)`

With [this commit], the attachment's "Add to Document" action allows creating a Document from a 
mail.thread record attachment. When the user deletes the documents related to the attachments and 
then opens the payslip again, the compute method runs to calculate the linked document ID for the 
payslip attachments and tries to retrieve attachments without documents [1].
The issue occurs when two or more attachments share the same payslip ID. While mapping the res_id 
of the attachments and grouping them by ID, the same payslip record is included multiple times for a 
single key [2] [3], which raises error here [4].

This commit ensures that the mapped res_id values are wrapped in a set, so duplicate IDs are removed 
and each payslip ID appears only once.

[this commit]: https://github.com/odoo/enterprise/commit/5fa4b74a2345ddd4858585c5e9a780d1ca5add57

[1]- https://github.com/odoo/enterprise/blob/21477b333f7a33cb582cd806236e4f9f8346d022/documents/models/ir_attachment.py#L26

[2]- https://github.com/odoo/enterprise/blob/21477b333f7a33cb582cd806236e4f9f8346d022/documents/models/ir_attachment.py#L45

[3]- https://github.com/odoo/enterprise/blob/21477b333f7a33cb582cd806236e4f9f8346d022/documents/models/ir_attachment.py#L48

[4]- https://github.com/odoo/enterprise/blob/21477b333f7a33cb582cd806236e4f9f8346d022/documents_hr_payroll/models/hr_payslip.py#L74-L76

sentry-7494229711

Forward-Port-Of: odoo/enterprise#118033

Currently an error is generated when the user tries to cancel a
draft POS order as follows:

- Install the `pos_enterprise` module with demo data
- Open the register of `Furniture store` and select any product
- Click on the `Upload` icon to save the draft order and go to the backend.
- Navigate Orders > Orders > open Draft order
- Click the `cog` icon and click `Cancel Order` >>> Error occurs

This issue is caused by the recent refactor introduced in [1]. The
`action_pos_order_cancel` action now returns the `order`
(`pos.order` recordset) instead of default returning `None`.

As a result, the `action` variable contains a `pos.order` recordset, and
an error is raised at line [2] when `setdefault` is called on it, since
`setdefault` expects a dictionary-like object.

This commit fixes the above issue by removing the code that returns the
`pos.order` object from the action. As a result, the action now behaves
as expected and returns the default value (`None`).


[1]: https://github.com/odoo/enterprise/commit/27f57036a1d0468efe6e68d7aceafe0f01b21f93
[2]: https://github.com/odoo/odoo/blob/48f93ca056633bd5cba36b66ee1008fb57ca666c/addons/web/controllers/utils.py#L24

Sentry-7354160052

Forward-Port-Of: odoo/enterprise#118035

__

## Short functional explanation of the error
When setting a time off for an employee who has a flexible schedule, in the attendance app, on the calendar with the 'days' view. We can see that the hours are grayed out from 8 hours to 16 hours. However, according to this message:
https://www.odoo.com/mail/message/1027495005
"[...] the entire day of absence might not be represented as such, which is an issue (for example if a flexible employee with 8h/day takes a day off, the duration of the leave should be 1 day/8 hours but on the gantt view everything should be gray from midnight to midnight)".
Moreover, when we select the Week or Month view on the calendar, the day off isn't grayed out. This comes from the fact that, for a flexible schedule, we consider that any time of the day can be a working hour; and we only grey out days in the calendar where no hour has been worked at all. Hence, the hours considered during a flexible day off should be from midnight to 23:59:59.

## Reproduction Steps
1. Go to an employee's profile and set their schedule to flexible.
2. Create a time off of a one-day duration for this employee.
3. Go to the attendance app and see the calendar.

### Expected behavior
When clicking on the Day view, all hours from midnight to 11pm should be grayed out.

When clicking on the Week/month view, the day of the time off should be grayed out.

### Unexpected behavior
When clicking on the Day view, hours from 8am to 4pm are grayed out.

When clicking on the Week/month view, the day of the time off isn't grayed out.

## Origin of the issue
First, we only consider the leave if the resource is fully flexible, i.e if the employee has no working calendar set:
 https://github.com/odoo/odoo/blob/394a30f8a2814d460cfe220b5017e7ac95d8cddc/addons/resource/models/resource_calendar.py#L546
However, if the schedule of the employee is flexible, the leave resource isn't considered as fully flexible, thus leading us to a leave from 8 am to 4 pm.

Moreover, when processing flexible leaves, we return the unavailable intervals with the timezone of the employee:
https://github.com/odoo/odoo/blob/394a30f8a2814d460cfe220b5017e7ac95d8cddc/addons/resource/models/resource_calendar.py#L589-L592 Whereas when we process fixed leaves, we return the unavailable intervals under utc:
https://github.com/odoo/odoo/blob/394a30f8a2814d460cfe220b5017e7ac95d8cddc/addons/resource/models/resource_calendar.py#L597-L601

This leads us to display problems: when the user is under European/ Brussels time in summer, the leave starts at 2 am and ends at 11pm, instead of starting at midnight.
Note: after discussion with AJU, it has been agreed that the behavior
should be the same on the Planning app.
__
opw-6030212

Forward-Port-Of: odoo/enterprise#118832
Forward-Port-Of: odoo/enterprise#112482

### Description of the issue/feature this PR addresses:
This PR introduces batch processing to the VAT Books ES (Libros de IVA) report generation. When attempting to export the report for periods containing a massive volume of invoices, the ORM cache continuously accumulates records, leading to severe memory consumption. By implementing batching and explicitly clearing the environment cache, use memory use will remain stable and efficient.

### Current behavior before PR:
Generating the VAT Books report loads all account move lines into memory at once. Because the ORM cache is never cleared during the iteration, RAM usage spikes continuously. On databases with tens or hundreds of thousands of invoices in a single period, this leads to significant performance degradation, worker timeouts, or complete Out-Of-Memory (OOM) crashes.

### Desired behavior after PR is merged:
The report engine now splits the recordset into manageable batches (e.g., 50,000 accounts per batch). After processing each chunk to extract the income and expense line values, invalidate_model() is called to flush the ORM cache related to the searched records. This frees up memory continuously, keeping the server's RAM usage flat and allowing the successful export of massive datasets without crashing.

### Benchmark:
The model is iterating through ~1.1M account move lines when generating the full report. 

For Memory:
| # Input Data | Before PR | After PR|
| -------- | -------- | -------- |
| ~77,000 account move lines | 385 MB | 666 MB |
| ~340,000 account move lines |1.2 GB | 1.5 GB |
| ~1.2M account move lines | MemoryError | 1.5 GB |

For Speed:
| # Input Data | Before PR | After PR|
| -------- | -------- | -------- |
| ~77,000 account move lines | 32s | 12s |
| ~340,000 account move lines | 2:29min | 1:11min |
| ~1.2M account move lines | MemoryError | 4:11min |

### Reference

opw-6037414

-----------------------------------------------------------------
I confirm I have signed the CLA and read the PR guidelines at [www.odoo.com/submit-pr](http://www.odoo.com/submit-pr)

Forward-Port-Of: odoo/enterprise#118903
Forward-Port-Of: odoo/enterprise#116139

**Steps to reproduce:**
- Install the `l10n_gt_edi` module and switch to a `GT Company`.
- Navigate to Invoicing > Vendors > Bills.
- Create a new vendor bill.
- Observe that `GT Document Type` includes `NABN - Nota de Pago Electrónica` option.
- `Confirm` the bill.
- Click `Credit Note`, add a reason, and click `Reverse`.
- Observe the available options in the `GT Document Type` field.

**Observation:**
The `NABN - Nota de Pago Electrónica` option is not available for 
vendor credit notes (`in_refund`), even though `NABN` is a GT-specific 
credit note document type.

**Root Cause:**
At [1], `NABN` is added for vendor bills (`in_invoice`, `in_receipt`) 
instead of vendor credit notes (`in_refund`).

**Fix:**
This commit ensures users can correctly select `NABN - Nota de Pago Electrónica` 
on GT vendor credit notes.

[1]:
https://github.com/odoo/enterprise/blob/c7fa8c9c6f6830f5702fab4f6efaf3ac33f7fe72/l10n_gt_edi/models/account_move.py#L159-L160

opw-6252256

Forward-Port-Of: odoo/enterprise#119259
Forward-Port-Of: odoo/enterprise#118711

## Steps to Reproduce:
1. Install the Accounting module.
2. Go to Accounting > Reporting > Executive Summary.
3. Activate debug mode.
4. Click on the gear icon at the top.
5. In the "Options" tab, disable the "Date Range".
6. Open the report again.

## Error:
`TypeError - unsupported operand type(s) for -: 'datetime.date' and 'NoneType'`

## Cause:
At [1], when the "Date range" option is disabled in the summary report, `date_from` becomes None. The NDays expression still computes `date_to - date_from` at [2], which raises a TypeError because subtraction between a datetime and NoneType is not supported.

## Fix:
This commit takes the fiscal-year's start date, when the date-range feature is disabled.

[1] - https://github.com/odoo/enterprise/blob/a9cadd93b849375edfcc7fd04612d9eb8787043b/account_reports/models/account_report.py#L564-L570
[2] - https://github.com/odoo/enterprise/blob/a9cadd93b849375edfcc7fd04612d9eb8787043b/account_reports/models/executive_summary_report.py#L15-L16

sentry-7455506965

Forward-Port-Of: odoo/enterprise#119162
Forward-Port-Of: odoo/enterprise#116888

**Steps to reproduce:**
* install `l10n_lu_reports`.
* Create a company in Luxembourg with a `company_registry` number set.
* Link this company to an accounting firm that is a natural person (independent accountant) with no business registration number — i.e. `l10n_lu_agent_rcs_number` is left empty on the agent partner.
* Go to the tax report and generate the XML declaration.

**Observed behavior:**
* The `<Agent><RCSNbr>` field in the generated XML contains the company's own `company_registry` value instead of `NE`.
* The file is rejected by the Luxembourg tax administration.

**Cause:**
* In `l10n_lu_generate_xml.py`, the `agent_rcs_number` template value was built with a plain `or` chain: `agent.l10n_lu_agent_rcs_number or company.company_registry or "NE"`
* When an agent is set but has no RCS number (natural person), the fallback incorrectly continued to `company.company_registry` instead of stopping at `"NE"`.

**Fix:**
* Use a conditional expression so that `company.company_registry` is only used as a fallback when **no agent is linked** to the company: `(agent.l10n_lu_agent_rcs_number if agent else company.company_registry) or "NE"`

opw-6044689

Forward-Port-Of: odoo/enterprise#112968