Hi Kabil,
How i understand your requirement.
Want to insert the line while selecting the line without selecting icon.
Inside PAI.
Try,
MODULE TBC_100_MARK INPUT.
INSERT INITIAL LINE INTO <internal_table> INDEX <n>. " Below the selected line or above using index no
OR
APPEND INITIAL LINE TO <internal_table> "Adding intial lines at last .
ENDMODULE.
Hope it helpful,
Regards,
Venkat.