Change PO on Pick Ticket

Process 
 The process for changing the Z Pick Ticket PO number: 
 
 When closing the Pick Ticket in the SF2 screen from Invoicing will have a new field for the New Po Number 
 If you enter a different PO number you will receive the question to “really change [original PO number]? You will need to answer the question with Y or N, the default being Y 
 You will then be prompted “really invoice [original PO number]? 
 The PO number will be changed on all associated pick tickets