I added a custom field on billing screen at item level in VF01/VF02/VF03 .For this field I created corresponding append structure in dictionary VBRP-ZF1
Save action work fine and value get stored in ZF1. I used implicit enhancement.
Now I need that same field gets populated from value maintained in standard idoc customer data segment starting as E1W....
I may use a different field in standard idoc segment E1W..
having value intended to get saved in VBRP-ZF1.
How to achieve this ?