Avinash,
Make sure you’re updating the AccountId of the Case model that’s on the field editor in the pop-up (right now you’re updating the AccountId of Case, but I’m guessing you need to update the AccountId of NewCase). Also, I’m sure you did, but can you double-check that the name of your Entitlement model on page matches what you have in {{$Model.Entitlement.data.0.Account__r.Id}} and that Account__r.Id is in that model? For instance, if my Entitlement model was named EntitlementModel then I would put {{$Model.EntitlementModel.data.0.Account__r.Id}}.
Thanks!
Amy
