Die Schwalbe
The search command is not correct.
COMMENTDATE>=20200919 AND NOT K='Hilfsrückzüger' AND NOT S='Freie Presse (Chemnitz)' AND S='L'Echiquier (Brüssel)'
atomic expression must have form 'field = value' [( COMMENTDATE >= $$NUMBER0 AND NOT K = $$STRING1 AND NOT S = $$STRING2 AND S = $$STRING3 ECHIQUIER ( BRÜSSEL ) $$STRING6]