Add a table control in BP

Hello Gurus,

I have added a custom view in BP with a table control. If I delete all the lines of the table control I get a message in business workplace after SAVING saying that the booking has been interrupted. I don't understand this error message.

Here the code:

PROCESS BEFORE OUTPUT.

MODULE f_pbo_1003.
MODULE tc_sprt_change_tc_attr.

LOOP AT gt_tc_btab INTO gs_tc_btab WITH CONTROL tc_sprt CURSOR tc_sprt-current_line.
MODULE tc_sprt_get_lines.
MODULE tc_sprt_display.
ENDLOOP.

PROCESS AFTER INPUT.

LOOP AT gt_tc_btab.
FIELD gs_tc_btab-xmark MODULE tc_sprt_mark ON REQUEST.
MODULE tc_sprt_user_command.
MODULE tc_sprt_modify.
ENDLOOP.

MODULE f_pai.

Please help! 😊