associate tables

Hi all, I have a question. Is it possible that associates persistable entity with non-persistable entity? I am trying to Mendix entity and SAP entity, but error message is shown as below "Non-persistable  entity(SAP table) contains access rules restricting members to have no access rights, which is not allowed." I surely understand the meaning of this error, but I want to manage to associate these tables... Please help.
1 answers

You can associate non persistable objects to persistable objects. But not the other way around.

The reason you are receiving this error is different through. 
You can fix this by opening the non persistable entity in your domain model and adding access rules for the required role you are logged in with.
A non persistable entity must have every attribute at least on Read access from what i know.