[FIX] account_interest: Correct interest calculation for late payments with multiple associated payments per invoice

X-original-commit: 8559324

Author: rov-adhoc

academic_account_interests/models/res_company_interest.py

@@ -94,13 +94,15 @@ def _calculate_debts(self, from_date, to_date, groupby=None):
             )
 
             for move_line, parts in partials.items():
-                due_date = max(from_date, parts.debit_move_id.date_maturity)
+                for part in parts:
+                    due_date = max(from_date, part.debit_move_id.date_maturity)
+
+                    days = (part.credit_move_id.date - due_date).days
+                    interest = part.amount * days * (self._calculate_rate() / interest_rate[self.rule_type])
+                    #Se debe actualiza la deuda del partner, por ello se llama al cliente metodo para su actualizacion
+                    self._update_deuda(deuda, move_line.student_id, 'Deuda pagos vencidos', interest)
+                deuda[move_line.student_id]['partner_id'] = move_line.partner_id
 
-                days = (parts.credit_move_id.date - due_date).days
-                interest = parts.amount * days * (self._calculate_rate() / interest_rate[self.rule_type])
-                # Se debe actualiza la deuda del partner, por ello se llama al cliente metodo para su actualizacion
-                self._update_deuda(deuda, move_line.student_id, "Deuda pagos vencidos", interest)
-                deuda[move_line.student_id]["partner_id"] = move_line.partner_id
 
         return deuda