How to validate with LIFNR

Hi ABAPer's ,

I have a question that how to validate the screen input field using key LIFNR with the tables given:

EKKO,

EKPO,

EKET,

LFA1,

MAKT,

TOO1W.

in ALV Classical report?

If i give 1 to some char in select options i should not get the values, if i give the lifnr values i should get the values.

Plz help me out of this.