Creating Flex Business Rule

I am trying to create simple Flex Business rule. I am trying to force the usage of Closing Codes if user is trying to close "Breakdown" type of work. SQL querry (which does not work) is: SELECT NULL

FROM R5EVENTS

WHERE EVT_SQLIDENTITY =:ROWID

AND EVT_JOBTYPE = 'BRKD'

AND EVT_TYPE = 'JOB'

AND EVT_STATUS='C'

AND (EVT_REQM IS NULL

OR EVT_FAILURE IS NULL

OR EVT_CAUSE IS NULL

OR EVT_ACTION IS NULL) Thsi one triggers on any update of R5EVENTS table (WO insert/updates, new Positions etc.) What am I doing wrong? Can somebody pls advise me...