Custom soa policy doesnt execute on soap-fault

I have created a custom WS policy. In the execute I check using if (stage == IMessageContext.STAGE.response) if I am in the response fase and then I check if it contains a soap fault but it seems when the business service generates a soap-fault , it never hits the execute again.

I was in the assumption that the execute allways hit twice. Once for incomming message and once for outgoing message no matter what reponse is returned.

Can anyone confirm this?

Much thanks!