One of the most common errors we could see when we use WCF adapters is "The action was not understood". This is most likely because the mismatch between the logical port operation identifier in a orchestration and the operation name of SOAP action header in WCF send port confguration. To fix the problem is very easy, just change one of them to have them match.
There is a very good article explaining why this happens. Click here to view the article.
...Edmund Zhao