Multi-Part message – “use of unconstructed message ” – Error message when you try to build a BizTalk project

Thank you Sandro. You have saved my time.

http://sandroaspbiztalkblog.wordpress.com/2009/04/29/multi-part-message-use-of-unconstructed-message-error-message-when-you-try-to-build-a-biztalk-project/