New tabs in the header tab-sheet of ME21N/ME22N/ME23N

I want to add a customer tab in the tabsheet on the header of transactions ME21N/ME22N/ME23N.

The data from this new tab will be stored in CI_EKKODB, no problem there.

Is it possible, using Badi ME_GUI_PO_CUST or should I simply do modifications of the standard?

Thank you,

Bogdan