SAP WCF MetadataException "RFC IDOC_INBOUND_ASYNCHRONOUSM could not be resolved against SAP"

If you run into this error

The adapter "WCF-Custom" raised an error message. Details "Microsoft.ServiceModel.Channels.Common.MetadataException: RFC IDOC_INBOUND_ASYNCHRONOUSM could not be resolved against SAP system because its metadata could not be obtained. ---> Microsoft.Adapters.SAP.RFCException: Details: ErrorCode=RFC_EXCEPTION. ErrorGroup=RFC_ERROR_APPLICATION_EXCEPTION. SapErrorMessage=FU_NOT_FOUND.  AdapterErrorMessage=An error occurred while determining the function interface of the RFC IDOC_INBOUND_ASYNCHRONOUSM.

then you might use a the new WCF SAP adapter with a Non-Unicode RFC Destination. The BizTalk Adapter Pack 2013 does not seem to be compatible with Non-Unicode RFC as it was before. The only solution seems to be to create a new RFC Destination in SAP.