in table control i want to modify table control internal table after user PRESS ENTER .
but internal table is not getting modified it is giving sy-subrc = 4.
please help me how to modify internal table and display the data in table control in module pool program
my logic:
FLOW LOGIC:
PROCESS BEFORE OUTPUT.
MODULE status_0483."""for pf status
LOOP AT gt_fdint INTO gs_fdint WITH CONTROL tab_con CURSOR
tab_con-current_line.
ENDLOOP.
PROCESS AFTER INPUT.
LOOP AT gt_fdint .
CHAIN.
FIELD gs_fdint-zselno.
FIELD gs_fdint-zcustm.
FIELD gs_fdint-zfddes.
FIELD gs_fdint-zstart.
FIELD gs_fdint-zenddt.
FIELD gs_fdint-zaccrl.
FIELD gs_fdint-zintrs.
FIELD gs_fdint-zintdes.
FIELD gs_fdint-zpstdt.
FIELD gs_fdint-channel.
MODULE tc_acunt_modify ON CHAIN-REQUEST.
ENDCHAIN.
ENDLOOP.
MODULE user_command_0483."""USER COMMAND SUBROUTINE
MODULE exit_command_483."""EXIT COMMAND SUBROUTINE
MODULE tc_acunt_modify INPUT.
MODIFY gt_fdint
FROM gs_fdint
INDEX tab_con-current_line.
ENDMODULE.
hear internal table is initially contains no record, if i give sone input in table control and press enter then
MODULE tc_acunt_modify ON CHAIN-REQUEST. is triggering and but it is not modifying the internal table
after MODIFY statement it is giving SY-SUBRC = 4.