取消采购单时，如果该采购单关联的库存移动是由采购申请创建的，则不取消

jikimo_purchase_request/models/purchase_order.py

@@ -27,4 +27,14 @@ class PurchaseOrder(models.Model):
         if reverse_move_ids:
             reverse_move_ids.picking_id.action_cancel()
         return res
+    
+    def button_cancel(self):
+        """
+            将取消的采购订单关联的库存移动撤销
+        """
+        move_ids = self.order_line.move_dest_ids.filtered(lambda move: move.state != 'done' and not move.scrapped)
+        res =super(PurchaseOrder, self).button_cancel()
+        if move_ids.mapped('created_purchase_request_line_id'):
+            move_ids.write({'state': 'waiting', 'is_done': False})
+        return res