LOCK TABLE unsupported on write servers [CR 555776]

Multiplex write servers do not support the LOCK TABLE command. Sybase IQ returns this message:

Could not execute statement.
Permission denied: Command not allowed on 
Multiplex Writer servers.
(saint_iqthresholdddl.cxx 14868)
SQLCODE=-1004015, ODBC 3 State="HY000"
Line 1, column 1