When transferring an order to a table that already has an open order, identical products are merged into a single line. If both orders were already sent to the kitchen printer, the merged line was incorrectly marked as new and had to be sent again.

Steps to reproduce:
-------------------
* Open table 1, add product A (2 units) and product B, send to kitchen
* Open table 2, add product A (3 units) and product C, send to kitchen
* On table 2, transfer/merge the order to table 1

> Observation:
product A shows 2 units as new and must be sent to the kitchen printer again, although all quantities were already sent.

Why the fix:
------------
When merging preparation history for identical lines, handlePreparationHistory overwrote the destination sent quantity with the source one instead of summing both. The kitchen diff then treated the missing quantity as new changes.

A unit test will be added in 18.3.

opw-6246470

Forward-Port-Of: odoo/odoo#271828
Forward-Port-Of: odoo/odoo#267915

### Steps to reproduce:

- In the settings enable: Multi-Steps Routes
- Put your warehouse in delivery in 2 steps
- On the receipt operation type change the return operation type to be "pick" by default.
- Create and confirm a PO for 1 unit of P
- Validate the receipt > return > Create the return for 1 unit
- Change the operation type of the return from Pick to Delivery to return the product in one step.
- Validate the return
#### > The qty_received is updated from 1 to 2 instead of 0.

### Cause of the issue:

Updating the `picking_type_id` of the return will also update the `location_dest_id` to the default values:
https://github.com/odoo/odoo/blob/89807c10c20fb533124b18815f307fc3c380528d/addons/stock/models/stock_picking.py#L1138-L1147
However, the default values of the `Delivery` is "Partner/customer". As such, the location dest of the move is also updated to be "Partner/customer". Now the issue is that the `qty_received` only considers moves to be returned if the location dest usage is not 'supplier':
https://github.com/odoo/odoo/blob/89807c10c20fb533124b18815f307fc3c380528d/addons/purchase/models/purchase_order_line.py#L226-L231 https://github.com/odoo/odoo/blob/89807c10c20fb533124b18815f307fc3c380528d/addons/purchase_stock/models/purchase_order_line.py#L55-L67 https://github.com/odoo/odoo/blob/89807c10c20fb533124b18815f307fc3c380528d/addons/purchase_stock/models/purchase_order_line.py#L76-L77 https://github.com/odoo/odoo/blob/89807c10c20fb533124b18815f307fc3c380528d/addons/purchase_stock/models/stock_move.py#L129-L131

opw-6292918

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Forward-Port-Of: odoo/odoo#270438
Forward-Port-Of: odoo/odoo#269867

Issue:
---
Not having at least one variant created for a product template with
dynamic attributes can cause issues as it's expected a product template
to have at least one variant.

To reproduce:
1- Create a dynamic attribute with values.
2- Create a product and without saving:
 - Enable track inventory.
 - Add the dynamic attributes and values.

3- Save the product.
4- Click on forecasted quantity smart button:
 - There is a traceback.

5- Click on Replenish:
 - Unexpected behavior.

6- Click on `Product On Hand Quantity`:
 - No product will be shown if you try to add quantity.

Cause:
---
This is caused because there is no variant created. In the steps,
if you save the template once before adding dynamic attributes, a
single variant will be created which allows it to work without issue.

Fix:
---
we can fix the TB by hiding the forecasted qty smart button,
when there is no variant.

However, there will be still issue with `Replenish` flow, which
requires a variant. We could do the prevent the issue by ensuring
there is at least one variant.

opw-6260253

Forward-Port-Of: odoo/odoo#268879

Currently, accounts with the `Other Expenses` account type cannot 
be selected in financial budget lines.

**Steps to reproduce:**
- Install the `accountant` module.
- Go to `Chart of Accounts` and create a new account with `Type: Other Expenses`.
- Go to Accounting > Configuration > Financial Budgets.
- Create a new budget and add a budget line.
- Try to select the newly created account.

**Observation:**
Accounts with the `Other Expenses` type are not
available for selection in budget lines.

**Root Cause:**
At [1], the `expense_other` account type is missing from the `account_id` domain.

**Expected Behavior:**
Financial budgets should allow all Profit & Loss accounts, since the feature relies on P&L reporting.

**Reference**: https://www.odoo.com/odoo/project/49/tasks/4314709

**Fix:**
This commit ensures that users can add `Other Expenses` accounts to budget lines.

[1]:
https://github.com/odoo/enterprise/blob/41b66ba081f3938f7e55da209506c637850ae4ec/account_reports/models/budget.py#L114-L120

opw-6313835

### Steps to reproduce:
- Download Calendar and Contacts app
- Go to the Setting -> Companies -> Manage companies; make sure there are at least two companies
- Go to the Setting -> Users -> Manage users; make sure the current logged-in user has access to both companies
- Create a another user who also have access to both companies
- Search for the new user in contacts -> Assign the current company to the contact -> Through the internal link of the company, go to sales and purchase tab -> assign the same company in the company field
- Switch the company of the logged in user to the other company
- Open the test contact form, use the meeting smart button and create a new meeting
- Open the kanban contact view

 **> Access Error: Uh-oh! Looks like you have stumbled upon some top-secret records.**
### Cause of Issue:
When trying to view the search results in kanban view, the `meeting_count` is calculated for each contact. Hence,`_compute_meeting_count()` is called which calls `_compute_meeting()`. https://github.com/odoo/odoo/blob/f39785bcddd1eb5b7fb503d053c9bb66e2a0f15c/addons/calendar/models/res_partner.py#L49-L54 Since the above section tries to access `partner.parent_id` each loop, it reaches a `parent_id` that's not accessible for the current user.

### Fix:
Since we need to access `parent_id` to be able to calculate meeting count for the full tree of partners, `sudo()` is used to get all partners, but meetings are computed for ancestors who are in `self_ids` only so that we still remain within scope.
Same old logic is used to propagate meetings for every ancestor, but dictionary lookups are used to enhance performance.

opw-5874204

Forward-Port-Of: odoo/odoo#248985

When a user chooses the "Double Opt-in" template (or others using
`_create_records_with_xml_ids`), the system creates records like the
"Confirmed contacts" list and a server action. It also adds an
`ir.model.data` entry for them under the module, but sets
`noupdate=False`.

The problem is that during a module upgrade, Odoo's cleanup process
(`_process_end`) deletes any record marked `noupdate=False` if it
wasn't "reloaded" from a file. Since these records are created
manually in the code and aren't in any XML file, they never get
reloaded, so Odoo just deletes them and the records they point to.

By setting `noupdate=True` when these rows are created, we tell
the system to leave them alone during upgrades. Since these only
exist at runtime and don't have a data file, we don't need to
worry about them being updated later anyway.

The helper was added in
https://github.com/odoo/enterprise/commit/fd98660e352512e0b74d91958707687978154833.

Steps to reproduce:
1. Install Marketing Automation
2. Go to Campaigns > New and pick the "Double Opt-in" template, then save
3. Confirm the "Confirmed contacts" mailing list and server action exist
4. Go to Apps and Upgrade Marketing Automation
5. Try to find the mailing list and server action again

=> They disappear after the upgrade.

Ticket [link](https://www.odoo.com/odoo/project.task/6140191)
opw-6140191

Forward-Port-Of: odoo/enterprise#115444

## Description of the issue/feature this PR addresses:
Setup plus video
1. Go to settings, enable "Automatic Valuation" and "Storeable Locations".
2. Navigate to Product Categories.
3. Create a new product category with the costing method Standard Price and the inventory valuation Automatic.
4. Navigate to Products, click into any product.
5. Add the new product category to this product under General Information.
6. Add any tax in the purchase tax field.
7. In the Accounting tab of the product, add any account to the Price Difference Account field.

https://drive.google.com/file/d/1i2DHEt0g9G5Edad_QB3QaFkOT49cbMAZ/view?usp=sharing

Instructions to reproduce error
1. Navigate to Purchase.
2. Add a customer, then add the configured product.
3. Add a tax to the line. Ensure that the tax and price_unit are nonzero.
4. Confirm the order.
5. Receive the product.
6. Create the bill.
7. Edit the tax on the vendor bill, then save the changes. Notice that the changes are kept.
8. Select Confirm. Notice that the changes to the tax line are not kept, and that the COGS lines appeared (with taxes applied to them).
9. Reset the bill to draft.
10. Click into the configured product and remove the product category.
11. Repeat steps 7-8 . No COGS lines, and the tax line is the manually set value.

## Current behavior before PR:
COGS lines with taxes have no net effect on any tax lines as they cancel each other out. However, their creation triggers the recalculation of all tax lines, undoing any manual adjustments to tax lines.

## Desired behavior after PR is merged:

This commit ensures that COGS lines are not considered base tax lines, so that their creation does not trigger the recalculation of other base tax lines.

opw-5387248


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Forward-Port-Of: odoo/odoo#271262
Forward-Port-Of: odoo/odoo#262442

Module: l10n_it_pos

Steps to reproduce:
- In the POS settings, enable "Automatic Receipt Printing";
- Enable "ePos Printer" to make the "Skip Preview Screen" option appear;
- Disable "Skip Preview Screen";
- Disable "ePos Printer";
- Set up an Italian Fiscal Printer;
- Open a POS session and process a first order.

Issue: After the first receipt, no other messages (price display, receipt, open register) are sent to the fiscal printer. A page reload is required.

Cause:
When "Automatic Receipt Printing" is true but "Skip Preview Screen" is false, a race condition occurs. `afterOrderValidation` triggers a print job while simultaneously transitioning to the `ReceiptScreen`. When the `ReceiptScreen` mounts, it triggers a second fiscal print job before the first has resolved. This creates a deadlock in `toHtml` of  `renderService`, permanently blocking the printer queue.

Solution:
Since the italian localisation sending the receipt to the fiscal printer is mandatory, the printing route is now tied to the "Skip Preview Screen" option.
UI settings are adjusted to hide the redundant auto-print checkbox when an IT fiscal printer is configured.

Community PR: https://github.com/odoo/odoo/pull/256932

[opw-5979212](https://www.odoo.com/odoo/project/49/tasks/5979212)

Forward-Port-Of: odoo/enterprise#121779
Forward-Port-Of: odoo/enterprise#112654

In POS Restaurant with Germany Fiskaly enabled, splitting and paying from a table works once, but repeating the same flow from the Orders tab lets the parent order show lines that were already paid in previous splits. Functionally, the cashier can keep splitting and paying the same line again and again because the parent draft order is not updated consistently in that path.

Steps to reproduce:
-------------------
* Enable POS Restaurant with l10n_de Fiskaly
* Create a table order (e.g. 3 meals + 3 drinks)
* Open Split Bill, move 1 meal + 1 drink, and pay
* From Orders tab, open the remaining parent order and repeat split + pay
* Reopen the parent order from Orders tab

> Observation:
The parent order still contains quantities that were already split/paid, so the same items can be paid multiple times from the Orders tab.

Why the fix:
------------
The Fiskaly `syncAllOrders` override diverged from core sync behavior in the split flow: it ignored explicit `options.orders` and did not await transaction creation for inactive transactions. In the split-bill path this could skip or desynchronize parent-order updates, leaving stale quantities on the parent order.
The fix restores expected sync semantics by honoring `options.orders` and awaiting transaction creation before deciding sync eligibility.

opw-6175880

When a user chooses the "Double Opt-in" template (or others using
`_create_records_with_xml_ids`), the system creates records like the
"Confirmed contacts" list and a server action. It also adds an
`ir.model.data` entry for them under the module, but sets
`noupdate=False`.

The problem is that during a module upgrade, Odoo's cleanup process
(`_process_end`) deletes any record marked `noupdate=False` if it
wasn't "reloaded" from a file. Since these records are created
manually in the code and aren't in any XML file, they never get
reloaded, so Odoo just deletes them and the records they point to.

By setting `noupdate=True` when these rows are created, we tell
the system to leave them alone during upgrades. Since these only
exist at runtime and don't have a data file, we don't need to
worry about them being updated later anyway.

The helper was added in
https://github.com/odoo/enterprise/commit/fd98660e352512e0b74d91958707687978154833.

Steps to reproduce:
1. Install Marketing Automation
2. Go to Campaigns > New and pick the "Double Opt-in" template, then save
3. Confirm the "Confirmed contacts" mailing list and server action exist
4. Go to Apps and Upgrade Marketing Automation
5. Try to find the mailing list and server action again

=> They disappear after the upgrade.

Ticket [link](https://www.odoo.com/odoo/project.task/6140191)
opw-6140191

Forward-Port-Of: odoo/enterprise#115444

### Steps to reproduce the issue:
1. Download Accounting and l10n_it_edi_withholding
2. Switch to IT company
3. Create 2 taxes with a Pension fund type set (in Advanced Options)
4. Create an invoice and set on the same line the 2 taxes created
5. Click on send and print and see the error: Invoices must have at most one Pension Fund tax set per line. (even if it's not true)

### Cause of the issue:
The following function check how many taxes we have per line but this limit is incorrect because it is accepted by the Italian electronic invoicing specifications to have also more than 1 tax. 
https://github.com/odoo/odoo/blob/bd095fe286930acc54d85bdf7f92af15569f5b82/addons/l10n_it_edi/models/account_move.py#L1268-L1273

### Reference documentation:

1. [Art. 10 della Legge n. 183_2011, successivamente integrato dal D.L. n. 1_2012 (art. 9-bis)..pdf](https://github.com/user-attachments/files/29056003/Art.10.della.Legge.n.183_2011.successivamente.integrato.dal.D.L.n.1_2012.art.9-bis.pdf)

2. Following image:
<img width="823" height="580" alt="estrattoEppi" src="https://github.com/user-attachments/assets/e79be16f-651e-467a-84f4-8400185ceea4" />


opw-6264685

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Forward-Port-Of: odoo/odoo#269456

**Steps to reproduce:**
* Install the **l10n_gt_edi** module.
* Configure a Guatemalan company with valid Infile credentials in the settings.
* Create a product or customer with special characters (e.g. `ñ`, `á`, `é`) in their name.
* Create a customer invoice containing this product/customer.
* Confirm the invoice to trigger the EDI send to the SAT (Infile).

**Observed behavior:**
* Infile intermittently rejects the invoice due to validation errors, or accepts it but the resulting certified XML has truncated or malformed text exactly where the special characters were located.

**Cause:**
* Odoo uses the `requests.post()` library to send the XML payload to Infile. By default, `requests` encodes string payloads using `latin-1` unless told otherwise.
* Because the request was missing the explicit `Content-Type: application/xml` header and the XML string was not explicitly encoded to `utf-8` before sending, Infile parsed the payload using an incorrect encoding. This caused it to drop or misinterpret special characters, leading to validation failures or corrupted XML content.

**Fix:**
* Explicitly include the `'Content-Type': 'application/xml'` header in the request to Infile.
* Explicitly encode the `xml_data` payload to `utf-8` (`xml_data.encode('utf-8')`) before passing it to `requests.post()` to guarantee the correct encoding is sent over the wire.

opw-6315654