Entity validation with groovy expression

Hi,
I'm using jdeveloper 11.1.2.3.0
I have an entity object with two attributes "status" and "reason".
Only in case the user select status id "4" I would like to validate that he will select also reason.
for this I was trying to add entity validation with groovy expression.
so I added this expression "Status== 4 && Reason == null" and also I added failure message.
But it doesn't work as I expected.
The error is displayed every time, also when the user select status that is not 4 and also when he select status 4 and the reason is not null.
How should I write this groovy expression?
Thanks

Just to clarify,
If you add this validation to your status attribute then it will validate that Reason is not null when you change the status to 4.
If you want to raise an entity validation just add a new Entity Validator and the expression should be something like what you had:
But slightly different
Status != null ? (Status==4? (Reason!=null) : true) : true

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Just to clarify,
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If you want to raise an entity validation just add a new Entity Validator and the expression should be something like what you had:
But slightly different
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Just to clarify,
If you add this validation to your status attribute then it will validate that Reason is not null when you change the status to 4.
If you want to raise an entity validation just add a new Entity Validator and the expression should be something like what you had:
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