Did you try to read the code of the program ?
form update_database.
data: lt_del_rows type table of sflight,
lt_ins_keys type g_verifier->sflight_keys,
l_ins_key type g_verifier->sflight_key,
ls_sflight type sflight,
ls_outtab like line of gt_outtab,
lt_instab type table of sflight.
* §8.When all values are valid, use your internal tables
* to update your table on the database.
*!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
* IMPORTANT: This method has been disabled, as the program logic
* was erroneous: if a user doubled a line (insert with copied values)
* the data is not accepted by alv, so the line inserted in the table
* had initial values. If he then deleted the line, the deleted line
* also had initial values. On the other hand, the line stored as
* inserted was the line with the original, copied values. So the
* data base was updated with hte copied values which lead to a
* short dump.
*!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
