tcode me51n, me52n and me53n - Enhancement to Requisitioner field

Hi,

Please, I need help about tcode ME51N (ME52N and ME53N).

I've created a search help for Requisitioner field for that tcode. The search help worked fine, but the problem is about to update Requisitioner field on subscreen tab "Contact Person". Already put some break-points into Include program LMEGUICJM I'm not sure if it's in that program to create an enhancement or something else.

I've been searching a solution to that, but nothing yet.

Please, anyone give a tip.