Copying customer fieds from reference document in ME21N

Hi all,

In a 4.7 Enterprise environment:

I have added some customer functionalities to ME21N (Purchase Order - PO), in some customer screens (using the BADI's ME_GUI_PO_CUST and BADI_ME_PROCESS_PO_CUST). Everything works well.

The problem is that when I want to create a PO with reference to another document (another PO, to simplify) the customer fields are not copied form the reference document.

How could I copy these fields too into the new document (without having to enter them by hand again)?

Thank you,

Bogdan