Hi,
1. I would check at first – if I can consume that WCF from regular code (Console Application is easiest).
2. If good – than something is wrong with generating objects in BizTalk.
3. Try not consuming mex, but the second option (the upper radio button – don”t recall it’s name). If good – this would generate schemas + bindings for you.
If you get error on the beginning, even trying to consume from console application – something is wrong in your WCF., Else – something wrong in your BTS.
Is WCF written? Or it’s some kind of published orchestration/schema?
If written – check that your methods and all stuff you need access to, is public.
🙂