Die Schwalbe
The search command is not correct.
COMMENTDATE>=20200919 AND NOT K='Hilfsrückzüger' AND NOT CPLUS AND A='L'hermet, Rudolf'
atomic expression must have form 'field = value' [( COMMENTDATE >= $$NUMBER0 AND NOT K = $$STRING1 AND NOT CPLUS AND A = $$STRING2 HERMET , RUDOLF $$STRING3]