CRM2011 - Dialog - fetch field from related entity

Hi all,
I have a problem with dialog in CRM2011. I've created a dialog with Contact primary entity. Dialog is pretty simple, it has 4 simple questions.

The problem is that I need to fetch a field value from different Entity that is 1:N related to Contact.
With that field I need to make several conditions, to compare that fetched field with user responses.  Based on the results of that conditions I have different actions in dialog (update record, change field, send e-mail etc).

I've tried several ways to fetch that field from related entity, but unsuccessfully.

Any help would be appreciated,

Thanks,