Problem Summary

We have successfully installed a custom Jamaican Payroll module (cp_jamaican_payroll) on Odoo 19.0 (Odoo.sh Enterprise), but the payslip calculation fails because the custom rules are not running, despite numerous fixes.

The final issue is a database execution problem where the core system fails to see the necessary links, resulting in a Net Salary = Gross Salary output.

1. Environment and Final Status

2. Technical Symptoms and Code Failures

All code logic for the Jamaican deductions (PAYE, NHT, NIS) has been verified and is correct. The failure is a structural database issue.

A. The Core Error (Prevents Calculation)

When the payslip is computed, the rules fail because the context variable for the contract is not passed correctly:

NameError: name 'contract' is not defined

B. The Structural Problem (Prevents Module Load)

The attempt to fix the NameError by inserting the struct_id into the XML failed repeatedly, proving that the External ID is incorrect or corrupted in the database:

ValueError: External ID not found in the system: hr_payroll.structure_employee

This occurred across multiple attempts, including variations like hr_payroll.basic_structure.

C. The Code Solution Attempted

To fix both issues, we deleted the custom structure definition and instead tried to override the default "Regular Pay" structure using its default ID (hr_payroll.structure_employee) and the rules' XML IDs (jm_salary_rule_nht_employee, etc.).

Final Configuration (Code is Clean):

XML

<record id="jm_salary_rule_nht_employee" model="hr.salary.rule">
    <field name="struct_id" ref="hr_payroll.structure_employee"/>
    <field name="condition_python">result = employee.contract_id and employee.contract_id.wage > 0</field> 
</record>

<record id="hr_payroll_structure_employee" model="hr.payroll.structure">
    <field name="rule_ids" eval="[
        (4, ref('jm_salary_rule_nht_employee')),
        (4, ref('jm_salary_rule_nis_employee')),
        ... (etc.) ...
    ]"/>
</record>

What is the definitive, working XML ID for the base Employee Salary Structure in Odoo 19, or is there a required inheritance missing in the module's Python that prevents the contract object from loading?