FOR UPDATE has been incorrectly specified for a READ ONLY cursor.

Item	Value
SQLCODE	-813
Constant	SQLE_NON_UPDATEABLE_CURSOR
SQLSTATE	42W36
Sybase error code	7301
ODBC 2 State	42000
ODBC 3 State	42000

Probable cause

You attempted to declare a cursor FOR UPDATE on a query that is not updatable. Queries that contain DISTINCT, GROUP BY, HAVING, INTERSECT, EXCEPT or UNION, or that contain aggregate functions are read only. If the ANSI_UPDATE_CONSTRAINTS option is on, then queries that contain an join are read only. If the query references a view then the view may be non-updatable.