[Zope] NULL in datefields in DB and Zope

Hi Florent, I changed everything into normal text: If there are no values in a column with dates in my database (mySQL) the database returns "0000-00-00". ZOPE says: "Error Type: ValueError Error Value: Invalid value, 0000-00-00, for Faelligkeit in record 2" The exception is raised in: ...\lib\python\Shared\DC\ZRDB\RDB.py, line 272 How can I get the records with NULL-values in datefields with a ZSQL-Method? Regards, Egon <nofill>