PO Release Strategy is effecting Budget

Hello Team ,

At my client site , Purchase Order is released finally and printed. Due to PO, the budget consumption also happen at Funds Management side .

After printing the PO , now business wants to cancel / Delete that PO line items and want to utilize the same budget for some other purpose .

When Im trying to Delete the Line Items in PO, system is not allowing as its already printed and not allowing to reverse the release.

Do you have any Idea how to delete / change the PO line Items or Qty's after final release and printing the PO .

Thanks

GV Ganeshan .