clear the value

hello experts,

I want to clear the bahns field value from the lfa1 table.

here I am trying to write the code for it.... I got struck in the middle can anyone help me comeplete this code....

data: BEGIN OF it_train,

lifnr type lifnr,

bahns type bahns,

END OF it_train.

data: it_vend like STANDARD TABLE OF lfa1 WITH HEADER LINE.

select lifnr bahns into table it_train.

clear it_train-bahns.

Thanks a lot for your anticipation

Nitesha