I am having 3 field in alv grid say fld1,fld2 and fld3.
fld1 and fld2 is editable. I want to put some value in fld1 and
fld2 and i want the differance should come in fld3.
how can I do. pls give some logic.
I wrote in user comman but it is not reflected.
FORM user_command USING r_ucomm LIKE sy-ucomm
rs_selfield TYPE slis_selfield.