This update fixes an issue where tax returns were incorrectly including taxes from multiple provinces (like British Columbia) instead of just the relevant province (like Manitoba). This ensures tax reports accurately reflect provincial tax obligations, improving the accuracy of financial reporting. The change was triggered by a code adjustment to filter tax entries correctly.

Issue:
Validating a tax return creates an entry with all the tax aml from the company instead of filtering them according to the tax return type.

Steps to reproduce:
- In a company in Canada
- Invoice a Customer from British Columbia in the previous month (A)
- Confirm
- Go to tax report -> Return
- Review and Validate tax return for "Manitoba PST Return (CA)" for month A
- Click on the 3 dots -> View Entry

Current Behavior:
- Entry has lines for PST in British-Columbia and GST taxes

Expected behavior:
- Entry has lines for PST in Manitoba only

Cause:
https://github.com/odoo/enterprise/pull/98158 introduces method `_get_vat_closing_entry_additional_domain` in the wrong class.


opw-6065838

Forward-Port-Of: odoo/enterprise#116366

This update resolves an issue where the Sale Timesheet module would fail to load if certain menus were deleted from the database. The fix ensures the module checks for the existence of these menus before proceeding, preventing errors and maintaining stability. This improves the reliability of the Sale Timesheet functionality.

to reproduce issue:
1) make a database in 18.3 .
2) delete the menu/menus.
3) it will fail  on _load_menus_blacklist.

Forward-Port-Of: odoo/enterprise#116498

This update corrects a visual issue in the Project Gantt view where flexible employees were incorrectly marked as unavailable during weekends and off-hours. The fix ensures that flexible employees are only grayed out for approved leaves and public holidays, improving the accuracy of project timelines. This enhancement impacts how project managers visualize resource availability.

Steps to Reproduce
---
- Assign a flexible working schedule to an employee (no leaves)
- Open Project > Tasks > Gantt view grouped by Assignee
- The employee's weekends and off-hours are grayed out

Current Behavior
---
Flex employees with no approved leaves in the viewed date range have incorrect grayed-out days in the Project Gantt view.

Expected Behavior
---
Flex employees should have no grayed-out days except approved leaves and public holidays.

Issue
---
When a flex employee has no leaves in the viewed period, `_get_unavailable_intervals()` returns an empty dict for that resource. `_gantt_unavailability()` then falls back to `company_leaves`, producing incorrect gray intervals. The same case is already handled in `planning` (ref PR), but `project_enterprise` was not covered.

Fix
---
Add a guard in `_gantt_unavailability()` to return no unavailabilities for flexible resources absent from `leaves_mapping`.

Related : https://github.com/odoo/odoo/commit/5f1cd39944134ffa2c30c331f8a5daca56446d78 
task - 5063071

Forward-Port-Of: odoo/enterprise#113247