[FIX] rma_sale: recurrent RMA

If a product was already in an RMA in the past, we should be able to
place another RMA in the future.

rma_sale/models/sale.py

@@ -114,6 +114,12 @@ class SaleOrderLine(models.Model):
 
     def prepare_sale_rma_data(self):
         self.ensure_one()
+        # Method helper to filter chained moves
+
+        def destination_moves(_move):
+            return _move.mapped("move_dest_ids").filtered(
+                lambda r: r.state in ["partially_available", "assigned", "done"]
+            )
         product = self.product_id
         if self.product_id.type not in ['product', 'consu']:
             return {}
@@ -121,11 +127,20 @@ class SaleOrderLine(models.Model):
         data = []
         if moves:
             for move in moves:
+                # Look for chained moves to check how many items we can allow
+                # to return. When a product is re-delivered it should be
+                # allowed to open an RMA again on it.
                 qty = move.product_uom_qty
-                move_dest = move.move_dest_ids.filtered(
-                    lambda r: r.state in ['partially_available',
-                                          'assigned', 'done'])
-                qty -= sum(move_dest.mapped('product_uom_qty'))
+                qty_returned = 0
+                move_dest = destination_moves(move)
+                while move_dest:
+                    qty_returned -= sum(move_dest.mapped("product_uom_qty"))
+                    move_dest = destination_moves(move_dest)
+                    if move_dest:
+                        qty += sum(move_dest.mapped("product_uom_qty"))
+                        move_dest = destination_moves(move_dest)
+                # If by chance we get a negative qty we should ignore it
+                qty = max(0, sum((qty, qty_returned)))
                 data.append({
                     'product': move.product_id,
                     'quantity': qty,

rma_sale/tests/test_rma_sale.py

@@ -38,6 +38,10 @@ class TestRmaSale(SavepointCase):
         cls.order_out_picking.move_lines.quantity_done = 5
         cls.order_out_picking.button_validate()
 
+    def _rma_sale_wizard(self, order):
+        wizard_id = order.action_create_rma()["res_id"]
+        return self.env["sale.order.rma.wizard"].browse(wizard_id)
+
     def test_create_rma_with_so(self):
         rma_form = Form(self.env['rma'])
         rma_form.partner_id = self.partner
@@ -83,3 +87,34 @@ class TestRmaSale(SavepointCase):
         rma.reception_move_id.picking_id.action_done()
         rma.action_refund()
         self.assertEqual(rma.refund_id.user_id, user)
+
+    def test_create_recurrent_rma(self):
+        """An RMA of a product that had an RMA in the past should be possible"""
+        wizard = self._rma_sale_wizard(self.sale_order)
+        rma = self.env["rma"].browse(wizard.create_and_open_rma()["res_id"])
+        rma.reception_move_id.quantity_done = rma.product_uom_qty
+        rma.reception_move_id.picking_id.action_done()
+        wizard = self._rma_sale_wizard(self.sale_order)
+        self.assertEqual(
+            wizard.line_ids.quantity, 0,
+            "There shouldn't be any allowed quantities for RMAs"
+        )
+        delivery_form = Form(
+            self.env["rma.delivery.wizard"].with_context(
+                active_ids=rma.ids,
+                rma_delivery_type="return",
+            )
+        )
+        delivery_form.product_uom_qty = rma.product_uom_qty
+        delivery_wizard = delivery_form.save()
+        delivery_wizard.action_deliver()
+        picking = rma.delivery_move_ids.picking_id
+        picking.move_lines.quantity_done = rma.product_uom_qty
+        picking.action_done()
+        # The product is returned to the customer, so we should be able to make
+        # another RMA in the future
+        wizard = self._rma_sale_wizard(self.sale_order)
+        self.assertEqual(
+            wizard.line_ids.quantity, rma.product_uom_qty,
+            "We should be allowed to return the product again"
+        )