I'm trying to implement some validation in a create resource RCDC. The resource type "Team" must have a unique name, but only in the country being specified for it, i.e. NOT globally. We have team names duplicated, but distinct by country. Is it possible to contruct a UniquenessValidationXPath value checks the name and the country? This is for a new resource, so I can't check an attribute value. Here's what I have at the moment: <my:Property my:Name="UniquenessValidationXPath" my:Value="/Team[DisplayName='%VALUE%']"/> Here's what I'd like to see: <my:Property my:Name="UniquenessValidationXPath" my:Value="/Team[DisplayName='%VALUE%' and countryISOCode='%FORM_countryISOCode%']"/>

use %Attribute_countryISOCode%

Even if the entity hasn't been persisted? I'll give it a go thanks Evgeniy.