You tried to use the SET LOCK MODE TO WAIT statement on IBM Informix SE, but your IBM Informix SE database server uses CREATE LOCKING rather than System V locking. If the error recurs, note all circumstances and contact IBM Informix Technical Support.
The database server cannot execute the SET LOCK MODE TO WAIT statement because the host operating system does not have adequate support for locking to permit waiting for a lock to be released. On this system, your program will be notified when a table or row is locked (with an error such as -233 or -378); your program determines what to do next, such as rolling back the transaction and trying it again.