Linux + Apache + freetds + MsSQL 7.0

hi there, i have a 'little' problem: i am using the system above and select queries work fine. but i have problems to insert records into the db, even if the generated queries from the script works fine if you try them with the microsoft sql manager. i eliminated all critical fields in the insert operations like datefields etc. theres no error message at all and i do not understand why mssql_query($insertQuery) returns always FALSE an example: INSERT INTO Adressen (Datenbank, Bereich, Quelle, Unterquelle, Kundennummer, Anrede, Vorname, Nachname, Anschrift, Land, PLZ, Ort, Newsletter) VALUES ('x', 'x', 'x', 'x', 'x', 'm', 'stefan', 'kisker', '...', 'D', '11111', 'stadt', 'n') best regards, stefan