[FIX] include anglo-saxon price unit calculation in refunds.

Otherwise the anglo saxon entries won't be correct.
For example, the Interim (Delivered) account should balance
after receiving and triggering a refund on a customer rma.

rma/models/rma_order_line.py

@@ -58,6 +58,18 @@ class RmaOrderLine(models.Model):
                 pickings |= move.picking_id
         return pickings
 
+    @api.model
+    def _get_in_moves(self):
+        moves = self.env["stock.move"]
+        for move in self.move_ids:
+            first_usage = move._get_first_usage()
+            last_usage = move._get_last_usage()
+            if last_usage == "internal" and first_usage != "internal":
+                moves |= move
+            elif last_usage == "supplier" and first_usage == "customer":
+                moves |= moves
+        return moves
+
     @api.model
     def _get_out_pickings(self):
         pickings = self.env["stock.picking"]