How can i set variant in alv ?

I using this method but i can't get solution this way

How can i do this ?

data tab2 type DISVARIANT .

tab2-REPORT = sy-repid.

tab2-VARIANT = '/0010/'.   "Variant Name

tab2-username = sy-uname.

call method r_grid->set_variant

         exporting

            is_variant             = tab2

           i_save                 = 'A'.