### Steps to Reproduce:
- Enable dropshipping in Inventory settings
- Create a product with inventory tracking enabled
- Enable dropship under the Inventory tab for the product
- Add a vendor and quantity under the Purchase tab
- Create a sale order for the product
- Go to the Purchase stat button and confirm the order
- Click on the Dropship stat button and validate the transfer
- Open Helpdesk and create a new ticket for the same partner

### Issue:
The "Returns" stat button is not visible for dropshipped deliveries.

### Current behaviour:
- The helpdesk ticket allows returns of customer orders only if the order is outgoing. However, this does not cover the usecase where the order was dropshipped and still needs to be returned to the vendor.
- With the current behavior, the user needs to find the customer's order to return the transfer as it is not possible to do from the ticket.

### Expected behaviour:
Helpdesk tickets should also allow returns of dropshipped transfers (done and linked to the SO).

### Fix:
The helpdesk return logic was limited to only 'outgoing' pickings. This commit extends the 'return' button should be visible if there is at least one delivery or dropship order linked to the partner of the ticket

Issue:https://github.com/odoo/enterprise/pull/81378

task-4881338

Forward-Port-Of: odoo/enterprise#91402

Currently, the field `l10n_co_edi_ubl` is displayed without a label 
in the UoM form, confusing users.

**Steps to reproduce:**
- Install the `l10n_co_edi` module and switch to the CO Company.
- Navigate to Invoicing > Settings.
- Enable `Units of Measure & Packagings`.
- Open `Units & Packagings` and click `New`.

**Observation:**
The `l10n_co_edi_ubl` field appears between the `Quantity` label and 
its corresponding field, but its own label is not visible.

<img width="1905" height="324" alt="6180769_before" src="https://github.com/user-attachments/assets/f35c345a-f449-46e4-ad15-6981109fca7a" />


**Root Cause:**
The inherited view [1] inserts the field `l10n_co_edi_ubl` before 
`relative_factor` in the base view [2].

In the base view, `relative_factor` is wrapped inside a `<div>` with a 
shared label (`Quantity`). Since the new field is inserted inside this 
structure, it inherits the same layout without having its own label, 
resulting in the label being hidden.

**Fix:**
This commit updates the view to ensure that the field `l10n_co_edi_ubl` 
is properly displayed with its own label, avoiding UI confusion and 
improving form clarity.

**After:**
<img width="1907" height="376" alt="6180769_after" src="https://github.com/user-attachments/assets/f96470d3-8df2-4ca4-acf8-f6511a49d725" />

[1]:
https://github.com/odoo/enterprise/blob/7b0d07bce92fb4b2cb588344fb0f6e3dd5d94f4a/l10n_co_edi/views/product_uom_views.xml#L4-L13

[2]:
https://github.com/odoo/odoo/blob/bae4fa4e0dde2d2e2e4fcdbb968f630c080af818/addons/uom/views/uom_uom_views.xml#L15-L34

opw-6180769

__

## Short functional explanation of the error
When we have a subscription product that has already been sold. If we try to import a product with the same ID but where we change the subscription type of the product, the import is executed without issue. However, this leads to undesired behavior:
when we go to the product page and try to manually change the subscription type (set it back to subscription), the change is not applied as a warning is raised.

## Reproduction Steps
Make sure you have debug mode enabled.
1. Create a product, and check the Subscription box.
2. Click on Orders and create a Quotation with this product, then confirm.
3. Go to Products > Products. Select the list view and search for the product you just created. Select it, and click Actions > Export.
4. Check the import compatible field. Select the fields to export: name, id and recurring_invoice. Upon exporting, a file is downloaded.
5. Access that file and change the recurring_invoice to FAUX or FALSE if your computer is in English. Save the changes.
6. Unselect the product and click on the cog, top right > Import. Click on Upload Data File and select the file that you have downloaded upon exporting, then import.

### Expected behavior
A user warning is raised: we shouldn't be able to change the subscription type of the product when it has already been sold.

### Unexpected behavior
The import is processed normally. Then, when we access the product page, and try to check the Subscriptions box again, a warning is raised.

## Origin of the issue
Nothing prevents the import from occurring in that case.

__
opw-6143789

Forward-Port-Of: odoo/enterprise#115046

Commit 28b840b introduced logic to include `freight_costs` in the customs document generated bySendcloud. It introduced 2 new issues as a result:

1. When creating backorders, the `freight_costs` are not divided but instead propagated to all of the pickings.
2. When there is no SO, we were taking the total value of all delivered goods, which doesn't make much sense considering the `freight_costs` field should be the cost of the delivery itself.

Solution
-----
For the first problem, there are a couple things to keep in mind:
- the total `freight_costs` declared to the customs entity should be the amount invoiced to the customer
- products can be added and removed from the picking after the SO has been confirmed
- actual delivery cost can change between invoice date and actual delivery date
- picking can be split into multiple packages at the user's discretion

Considering all of the above, we will simply forward the invoiced amount with the first confirmed picking and none of the backorders.

-----
Ticket:
opw-6013387

Forward-Port-Of: odoo/enterprise#111304

Before commit:
The Norwegian VAT XML export fails Skatteetaten validation due to incorrect
decimal formatting, mathematical rounding mismatches between base and tax
amounts, missing mandatory legal notes, and invalid KID number formats.

Fix:
To strictly follow Skatteetaten validation rules for the Norway VAT XML, the
following changes were implemented:
- Ensured standard rates drop the decimal (e.g, `25.0` to `25`), and formatted 
  fractional rates like `11.11` to `11,11` in XML.
- Rounded down the `tax_amount` to align precisely with government mathematical
  expectations.
- `base_amount` converted into absolute value to ensuring the calculation
  (`base * rate = tax`) resolves perfectly.
- Add the mandatory `<merknad>` explaining the reverse charge method for codes
  81, 83, 86, 88, and 91.
- Clean the `company_kid` by safely stripping the 'NO' prefix, and 'MVA' suffix.

Expect:
The generated XML payload now adheres perfectly to Skatteetaten's strict
structural and mathematical rules, allowing the VAT return to pass government
validations successfully.

Related Community PR: https://github.com/odoo/odoo/pull/258390

Task-6033027

Forward-Port-Of: odoo/enterprise#116553
Forward-Port-Of: odoo/enterprise#110792