prob with module pool for display

I hv a layout having LIFNR, NAME1, ORT01.

next screen is 0.

and one push button display.

my requirment is if i will give some existing LIFNR, then it will show name1 & ort01

logic in PAI.

case sy-ucomm.

when 'display'.

select lifnr name1 ort01 from lfa1 into table itab where lifnr = lfa1~lifnr.

logic in PBO.

loop at itab.

move: itab-lifnr to lfa1-lifnr,

itab-name1 to lifnr-name1,

itab-ort01 to lfa1-ort01.

endloop.

when i am executing that user-defined t-code the layout is coming

but when i m pressing display it is coming to easy acess screen.

plz help me out.

i hv provided the complete logic.