SQL0407N Assignment of a NULL value to a NOT NULL column name is not allowed.
If you encounter this error and If the value for name is of the form “TBSPACEID=n1, TABLEID=n2, COLNO=n3”, you can determine the table name and column name using the following query:
C.TABNAME, C.COLNAME FROM SYSCAT.TABLES AS T,
SYSCAT.COLUMNS AS C WHERE
T.TBSPACEID = 2 AND T.TABLEID = 26 AND C.COLNO = 0 AND
C.TABSCHEMA = T.TABSCHEMA AND C.TABNAME = T.TABNAME