access denied (error message) using show region behaviour

I don't think what you've suggested is going to work Jason. If you look at the screen shot I have attached. This is the page that all users will be directed to from login. this is where they select their block/estate from the list.

So for example if a user logs in, and they are a resident form Onyx Mews. ( incidentally admin would have manually entered the access code into the 'AccessCode' table column' after the user verified its details.)

If this user selects any other block/estate than Onyx Mews, then the error message appears.

At the moment. I have an access rule for each block/estate which compares the Session Variable 'AccessCode' to the block/estates Access Code.( See attached screen shots ) If the user selects the wrong estate they are re-directed to an 'Access Denied' page.

I would rather just have an error message appear than direct to a page that simply says '!Access Denied ........'

Your probably getting fed up with me by now Jason... Appologies.