Defaulting Arrival Set when sales order line is split.

  Hi , We have an issue for defaulting the arrival set when sales order line is split. This is process user is doing. 1)Entered the sales order header details 2)Created sales order lines. 3) Attached/created arrival set for the above line. 4) Book the order. 4)Split the sales order line.(Manually at order level) 5)Arrival set is not defaulted to newly created sales order line. Seek your guidance , Thanks in advance. Prasad.