I have recently been editing some RCDC and came across this error again. There are a few references on the web, but I thought I would add a quick note about it.
Microsoft.ResourceManagement: Microsoft.ResourceManagement.WebServices.Exceptions.InvalidRepresentationException: Exception of type ‘Microsoft.ResourceManagement.WebServices.Exceptions.InvalidRepresentationException’ was thrown.
at Microsoft.ResourceManagement.Utilities.ExceptionManager.ThrowException(Exception exception)
at Microsoft.ResourceManagement.Data.Exception.DataAccessExceptionManager.ThrowException(SqlException innerException)
at Microsoft.ResourceManagement.Data.DataAccess.ProcessRequest(RequestType request)
at Microsoft.ResourceManagement.ActionProcessor.ActionDispatcher.ProcessInputRequest(RequestType request)
at Microsoft.ResourceManagement.WebServices.RequestDispatcher.ExecuteAction(RequestType request)
at Microsoft.ResourceManagement.WebServices.RequestDispatcher.ExecuteAction[ResponseBodyType](RequestType request)
at Microsoft.ResourceManagement.WebServices.RequestDispatcher.DispatchRequest[ResponseBodyType](RequestType request, Guid requestIdentifier, Object redispatchSingleInstanceKey, Boolean isRedispatch)
at Microsoft.ResourceManagement.WebServices.RequestDispatcher.DispatchRequest[ResponseBodyType](RequestType request)
at Microsoft.ResourceManagement.WebServices.ResourceManagementService.Create(Message request)
The error generally only occurs when you have been messing with either one of two things, the RCDC or the schema of an object / attribute / binding. The error basically states that there is a disconnect between what you RCDC is trying to create / update and what is available in the schema. You would have to retrace your steps a little to find the actual problem since I cannot advise you what is happening in your environment, but at least I hope this points you in the right direction.