How to data base fields values to screen fields

hi,

I am working with MIGO goods display.

Initially, I added a three fields to migo screen for example MKPF-Z_NUM.(Z_NUM is append structure to MKPF table).

Now when user enter the document in Migo screen when he says Display document,the field value(mkpf-z_num) has to display on MIGO screen.

thank you to u all.

Anu