personalization in Requistion form in Purchasing

Dear Board,

I am personalizing the ''need by date'' to make it required in our requisitions page in oracle 11i. It turns yellow (required) when opening up the page and if you click anywhere on the line, it will stay required, but its when you click away from the line it goes from required to just an optional field.... Any ideas????

help>diagnostics>custom code>personalize>set up seq to 1: Need by date required: level:fuction

Conditions tab:

trigger event:WHEN NEW RECORD INSTANCE

trigger object: Lines

Actions Tab:

seq:10

type:property

enabled:checked

Thanks

Ali