F-02 : capture user who made the entry

Dear All  ,

I am stuck in a problem ,

With Tcode - F-02 OR FBCJ when user make an entry , then I need to capture the user name who made this entry through F-02 .

So that while voucher printing through my z program I can display the user made this entry  .

Currently I am displaying the user name who posted the entry that  is captured in BKPF-USNAM .

But I  also want the  username who made  this entry .

So how I can display the username who actually made this entry via .F-02 .

Please suggest some ideas  .

Regards

Deep