PR> Sometimes the following error appears:
PR> EDBEngineError with message 'General SQL error. Could not position
PR> within a table (<tablename>). ISAM error: Lock timeout expired'.
PR> Process stopped.

This error occurs then another user has been started a long transaction with
*update* or *insert*
action!
Change program logic to minimize SQL work time or increase a wait time value
in:
BDE Administator/Drivers/Native/INFORMIX/LOCK MODE