Acess context data in masterpage

Hi,

I have an table os workers data i want to show. I created a "Main" page with the table binding and multiple occurence and its working great but (there's always a but Image may be NSFW.
Clik here to view. ) in my master page i want to know the value of a field in the "Main" body page.

in the masterpage calculate event i've used the $form.data.MAIN.fd_number.rawValue but the value is always the first occurence.

            using $record.data.GV_NUMBER.value returns nothing.

            xfa.resolveNodes( data.MAIN.fd_number).rawvalue also returns nothing

Any ideas?

Thanks

Miguel