Payroll now includes better Belgian benefit and leave data, shows worked-day amounts on payslips, and calculates 13th month pay more accurately. This helps employees and payroll teams see clearer payslip details and ensures special salary payments account for seniority and unpaid or reduced-work absences.

1/ Add Belgian benefit and leave types
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2/ [IMP] hr_payroll: display worked days amount on payslip
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Purpose
-----------

Currently, the number of days and hours for each `worked_days_line_ids` are
displayed on the payslip report. However the corresponding amount is not.

Specification
-----------------

For each `worked_days_line_ids` of a payslip, display the corresponding
amount on the report.
Amounts should be computed as follows:
Worked days lines of unpaid benefit type: 0
For other worked days lines:

1. Compute what the employee should **not** earn for the unpaid days
`unpaid amount = (average salary per day)*(number of unpaid days)`
The average salary per day is computed on a 3 month basis (there are always the
same number of days in 3 months=13 weeks).
=> `unpaid amount =  wage*3/13/5 (5 days/week)`

2. Compute what the basic salary becomes:
`basic = wage - unpaid amount`

3. Distribute the basic salary among paid worked days types.
`amount of the line = basic * (number of days of the line)/(total number of paid days)`

3/ [IMP] l10n_be_hr_payroll: 13th month salary structure
=============================================

Purpose
---------   
Currently, 13th month computation doesn't take into account several things:
    
- An employee should not receive a 13th month if he arrive after the 1st July
    
- The amount should be proportional to the employee seniority if he arrived between the 1st January and 1st July.
    
- Several benefit type should be deducted from the 13th month:
      - Unpaid
      - Time Credit
      - Parental Time Off
      - Unpredictable Reason
      - Long Term Sick
      - Long Term Sick > 12 months
      - Part Time Sick
      - Notice
    
Specification
--------
Take into account points above


Task 1923143

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This update adjusts Belgian payroll settings to reflect current employer social contribution rates and revised default allowances. It also changes how commissions are paid and adds a clearer, rule-based reimbursement option for employees commuting by private car.

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When a salesperson creates a quotation from an opportunity without a customer, Odoo now asks whether to create a new customer from the opportunity details or select an existing one. This prevents quotations from being created without customer information and keeps the opportunity and quotation aligned.

When creating a quotation from a opportunity that does not have any 
customer set, we ended up on a quotation without any customer or any of 
the contact information entered on the crm.lead.

With this commit, if no customer is set on the opportunity, when hitting New 
Quotation button,  a modal is displayed to ask the user what to do to fill in the 
customer field.

- Create a new customer : Use the information from the opportunity to create 
automatically a res.partner. Set the res.partner on the quotation 
and on the opportunity.
- Use an existing customer : Set this customer on the quotation 
and on the opportunity.

Extra
For consistency, in the 'convert to opportunity' modal, 
move the 'create a new customer' at the top of the selection values
+ change the group title to 'Customer' instead of 'Customers'

Task-1917332

The Belgian payroll accounting test data was updated to stay aligned with related payroll changes. This helps ensure automated checks continue to validate 13th month payroll behavior correctly without affecting regular users directly.

Adapt tests and demo data according to changes in community PR https://github.com/odoo/odoo/pull/30562

The salary configurator now presents clearer choices for phone subscriptions, including international communication as part of the highest plan. It also aligns commission plan handling with related payroll changes and updates commuting options by adding private car while removing the generic other option.

Belgian payroll contracts can now set a voluntary higher withholding tax rate, helping employees spread tax payments across the year instead of facing a larger year-end bill. Payslip reporting is also improved with clearer fleet vehicle information, including license plate display.

PDF attachment previews in Odoo Mail no longer display Odoo’s separate download button. This avoids duplicate controls because major browsers already provide a built-in PDF download option, making the preview cleaner for users.

Task 1945059
Since there is a button to download a pdf from the preview of all major browsers, there is no need to add one on the view in odoo

This change appears to address a locking conflict during automatic payroll loading, helping payroll processes run more reliably. It should reduce interruptions or failures when payroll data is loaded automatically, though the available PR details do not identify the exact files changed.

Description of the issue/feature this PR addresses:

Current behavior before PR:

Desired behavior after PR is merged:




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