Command not allowed on IMMEDIATE REFRESH text index

Error constant SQLE_TEXT_IMMEDIATE_NOT_ALLOWED
ODBC 2 State ERROR
ODBC 3 State ERROR
Severity 16
SQLCODE –1182
SQLSTATE WT015
Sybase error code 13333
Probable cause

You cannot use REFRESH TEXT INDEX or TRUNCATE TEXT INDEX on an index that is created with immediate refresh. You cannot alter a text index to use or stop using immediate refresh.