[FIX] delivery_postlogistics: remove obsoleted code, get sale pickings

history_ids has been removed as below link. So the code is obsoleted.

odoo/odoo@b3180c8#diff-9a22420c4a72cc9b6d558b3d832846c2e44a4f3731c6df9579d66c6279c4804eL54-L57

_get_origin_pickings is to determine number of pickings of a sale order.
So it should get pickings from sale_id of found picking.

Author: hailangvn

delivery_postlogistics/models/stock_quant_package.py

@@ -19,7 +19,7 @@ def _get_origin_pickings(self):
         self.ensure_one()
         move_line_model = self.env["stock.move.line"]
         move_line = move_line_model.search([("package_id", "=", self.id)])
-        return move_line.mapped("picking_id")
+        return move_line.mapped("picking_id.sale_id.picking_ids")
 
     def postlogistics_cod_amount(self):
         """ Return the PostLogistics Cash on Delivery amount of a package
@@ -59,16 +59,4 @@ def postlogistics_cod_amount(self):
                 )
             )
 
-        order_moves = order.mapped("order_line.procurement_ids.move_ids")
-        package_moves = self.mapped("quant_ids.history_ids")
-        # check if the package delivers the whole sales order
-        if order_moves != package_moves:
-            raise exceptions.Warning(
-                _(
-                    "The cash on delivery amount must be manually specified "
-                    "on the packages when a sales order is delivered "
-                    "in several packages."
-                )
-            )
-
         return order.amount_total