WHEN-VALIDATE-RECORD trigger is not working on Form Personalization

Hi All,

Please help. I add WHEN-VALIDATE-RECORD on shipping transaction form but  its not working.

This is my setup :

Function name : WSHFSTRX

Form name : WSHFSTRX

seq : 25

description : Validate when Pick Realease

trigger event : WHEN-VALIDATE-RECO10RD

trigger object : DLVB_S

condition : ${item.dlvb_s.attribute1.value} is null

Action :

seq : 10

type : Message

message type : show

Message text : 'Expediture name can not empty'

seq : 20

type : builtin

builtin type : RAISE FORM_TRIGGER_FAILURE

I test it, I leave attribute1 value is null, but no error show appear.

Please help me to fix this issue.

Thanks for any help.

Best Regards,

Dian