[FIX] account_payment: supplier invoice on more then one payment oder

The field move_line_id in payment.order.form only shows account move lines that still have
an amount to pay. This was lost during 333e83f.

addons/account_payment/account_move_line.py

@@ -27,9 +27,12 @@ class account_move_line(osv.osv):
     _inherit = "account.move.line"
 
     # delegate to parent, used for local fields.function redefinition
-    def _amount_residual(self, cr, uid, ids, field_names, args, context=None):
-        return super(account_move_line, self)._amount_residual(
-            cr, uid, ids, field_names, args, context=context)
+    def _amount_to_pay(self, cr, uid, ids, field_names, args, context=None):
+        return {
+            id: value['amount_residual']
+            for id, value in self._amount_residual(cr, uid, ids, field_names, args,
+                                                   context=context).items()
+        }
 
     def _to_pay_search(self, cr, uid, obj, name, args, context=None):
         if not args:
@@ -95,7 +98,7 @@ class account_move_line(osv.osv):
         return line2bank
 
     _columns = {
-        'amount_to_pay': fields.function(_amount_residual,
+        'amount_to_pay': fields.function(_amount_to_pay,
             type='float', string='Amount to pay', fnct_search=_to_pay_search),
     }
 

addons/account_payment/test/payment_order_process.yml

@@ -60,6 +60,10 @@
     assert invoice.partner_id == payment_line.partner_id, "Partner is not correct."
     assert invoice.date_due == payment_line.ml_maturity_date, "Due date is not correct."
     assert invoice.amount_total == payment_line.amount, "Payment amount is not correct."
+    assert payment_line.move_line_id.amount_to_pay > 0, "Move line paid"
+    assert len(self.pool("account.move.line").search(cr, uid,
+      [('amount_to_pay', '>', 0), ('id', '=', payment_line.move_line_id.id)])) == 0, \
+      "No payment order found for this move line"
 -
   After making all payments, I finish the payment order.
 -