Thanks, Reagan, your answer is very helpful!
Of course it's a shadow table, how didn't I think about this earlier!
I did a few checks on DB level. MLICHECK~ is indeed a table, it is marked as a valid object and it is empty:
SQL> select count(*) from "SAPSR3"."MLICHECK~";
COUNT(*)
----------
0
Are you really sure, that it's really safe to just drop the MLICHECK~ table on DB level ?
Many thanks in advance!