anchor.diff: +<%@page isErrorPage="true" session="false" contentType="application/json" pageEncoding="UTF-8"%>
   <%@page import="org.springframework.orm.jpa.JpaSystemException"%>
  -<%@page isErrorPage="true" session="false" contentType="application/json" pageEncoding="UTF-8"%>
   <%@page import="org.syncope.types.EntityViolationType"%>
   <%@page import="java.util.Set"%>
   <%@page import="java.util.Map"%>
  
positive.code:                 SyncopeClientErrorHandler.EXCEPTION_TYPE_HEADER,
                  SyncopeClientExceptionType.InvalidExternalResource.getHeaderValue());
          response.setHeader(
                  SyncopeClientExceptionType.InvalidExternalResource.
                  getElementHeaderName(),
                  ex.getCause() == null ? ex.getMessage() : ex.getCause().
                  getMessage());
  
  
negative.code:                 SyncopeClientErrorHandler.EXCEPTION_TYPE_HEADER,
                  SyncopeClientExceptionType.DataIntegrityViolation.getHeaderValue());
          response.setHeader(
                  SyncopeClientExceptionType.DataIntegrityViolation.getElementHeaderName(),
                  ex.getCause() == null ? ex.getMessage() : ex.getCause().
                  getMessage());
  
  