hr_employee_ppe: error when assigning multiple PPE to an employee.

[azucenatrey]

Module

hr_employee_ppe

Describe the bug

When you assign multiple EPIs to an employee, the following error is returned: ''' Error while validating constraint Expected singleton: hr.employee.ppe(5, 6) '''

To Reproduce

Affected versions: 12.0

Steps to reproduce the behavior:

1. Step in employee form.
2. Edit and add multiple PPEs.
3. Save.

Expected behavior Save without error.

[azucenatrey]

Solution proposed in PR: https://github.com/OCA/hr/pull/1351

[github-actions[bot]]

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