Enhanced Services Proxy Issue

We're in the process of upgrading our sites from version 3.08 to 3.15. We make extensive use of SUBTYPES and DOMAINS and so were pretty excited about the Exhanced Services Proxy function in the latest version.

I'm having some problems where if I turn on the proxy with the option to resolve coded value domains, I can no longer identify on features, it always returns no results.

Also, if for example I use the simple search to search our facilities layer, I can pick SITETYPE = 27 and get results, however if I select SITETYPE.Name() = Offtake (this is what the domain value 27 equals), then if returns no results.

Is there further configuration required to have this function properly? Because as it is we cannot use the proxy and our users would no longer be able to identify on the map and return information.

Hopefully it's something small that I'm missing.

Thanks.