**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#118711

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

**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