My ALV needs a selection screen were you can filter the invoices on the output that is used for them.
I tried to find the correct table were the list of document outputs is defined. First I came up with RV13B, then VN_T685B, but at the end I found the DNAST table. So now the selection parameter definition looks like this:
SELECT-OPTIONS: s_kschl FOR DNAST-KSCHL DEFAULT 'ZBC1' TO 'ZKN2'.