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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.

Requestor: urn:uuid:7fb2b853-24f0-4498-9534-4e10589723c4
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.