Transfer Order Updatable BAQ

I am attempting to create an updatable BAQ for our users to quickly update transfer order dates in one place. I have set up the BAQ as expected but the update function is showing no errors and stating a successful update, but returning the RequestDate and NeedByDate back to the original dates. When i trace this action through the transfer order entry, i see the method it updates on is “GetTransferShipDate” Do i need to code this into an Advanced BPM? If so i am not familiar with the coding process to redirect it to a different method.

Thanks in advance.