I recently encounter this error. It took a little bit of head scratching to work out why we were getting the error. The possible causes were quite high as we are using dynamically assigned maps (see code below). Message Assignment Shape Code SapOrderMapType = System.Type.GetType(SapOrde... //transform(MyOutputMsg) = MyMapType(MyInputMsg); transform (SapOrder) = SapOrderMapType(CanonicalPO); System.Diagnostics.Trace.Wr... "Transform to SAP schema complete.", TraceCategory);...