anchor.diff:                  SyncopeClientErrorHandler.EXCEPTION_TYPE_HEADER,
                   SyncopeClientExceptionType.InvalidExternalResource.getHeaderValue());
           response.setHeader(
  -                SyncopeClientExceptionType.InvalidExternalResource.
  -                getElementHeaderName(),
  +                SyncopeClientExceptionType.InvalidExternalResource.getElementHeaderName(),
                   ex.getCause() == null ? ex.getMessage() : ex.getCause().
                   getMessage());
   
  
positive.code:                 value();
      } else if (ex instanceof MissingConfKeyException) {
          response.setHeader(
                  SyncopeClientErrorHandler.EXCEPTION_TYPE_HEADER,
                  SyncopeClientExceptionType.NotFound.getHeaderValue());
          response.setHeader(
                  SyncopeClientExceptionType.NotFound.getElementHeaderName(),
                  ((MissingConfKeyException) ex).getConfKey());
  
negative.code:                 SyncopeClientErrorHandler.EXCEPTION_TYPE_HEADER,
                  SyncopeClientExceptionType.DataIntegrityViolation.getHeaderValue());
          response.setHeader(
                  SyncopeClientExceptionType.DataIntegrityViolation.getElementHeaderName(),
                  ex.getCause() == null ? ex.getMessage() : ex.getCause().
                  getMessage());
  
  