If Sourcing splits a PO line manually the Subinventory info get lost in the PO line

If Sourcing splits a PO line manually the Subinventory info get lost in the PO line. This is causing issues at receipt booking as we can’t see on which subinventory the receipt needs to be booked and it led to incorrect receipt bookings. SO's do not release automatically because of missing parts on the correct subinventory. In the end this cause a fulfillment risk and in addition it causes manual work to check where the parts are and transfer to correct subinventory. Once a PO line will be split manually the Subinventory information needs to be copied.

Please let me know if there is a standard way to copy the subinventory information.