[FIX] hr: Allow deleting departure reasons

closes odoo/odoo#131285

X-original-commit: 5db1538af8c3381ab7c9006e11db0844d8d365c1
Signed-off-by: Yannick Tivisse (yti) <yti@odoo.com>

addons/hr/models/hr_departure_reason.py

@@ -12,6 +12,8 @@ class DepartureReason(models.Model):
 
     sequence = fields.Integer("Sequence", default=10)
     name = fields.Char(string="Reason", required=True, translate=True)
+    # YTI TODO: Move reason_code to hr + adapt _unlink_except_default_departure_reasons
+    # to use the codes instead of refs
 
     def _get_default_departure_reasons(self):
         return {
@@ -22,4 +24,6 @@ class DepartureReason(models.Model):
 
     @api.ondelete(at_uninstall=False)
     def _unlink_except_default_departure_reasons(self):
-        raise UserError(_('Default departure reasons cannot be deleted.'))
+        master_reasons = [self.env.ref('hr.departure_fired', False), self.env.ref('hr.departure_resigned', False), self.env.ref('hr.departure_retired', False)]
+        if any(reason in master_reasons for reason in self):
+            raise UserError(_('Default departure reasons cannot be deleted.'))