Create a PS Message with Another OperID

I have a Process that displays vouchers POs  but have matching issues due to insufficent funds. Usually caused by AP Appling invoice to the wrong po

       So I have added an option to select a new PO that the requestor.  So AP Can create a new voucher and delete old or just correct voucher.

       But I wanted to go a step further (Since the PO is mine the "requestor") I should know where it needs to go. Using a Component interface I can build a new voucher with the corrected po info and cancel the old. It works great except for one thing !! ( I can create a Voucher But MOST requestors cannot)