Hi Rosalin,
Not working? means the information are not updating for MAKXT?
you can try below logic.
PROCESS ON INPUT.
module mod_matnr.
module mod_matnr.
if screen_field for is not initial.
select single maktx from makt
into screen_field_for maktx
where matnr eq screen_field for matnr.
endmodule.
endif.
Regards,
Praveer.