Service Layer BusinessPartner DocEntry field not exposed

In one of our projects we require to access the DocEntry field of the BusinessPartners (OCRD) entity.

The problem is that this field is not exposed in ServiceLayer only the CardCode as "key field". This was possible using DI API...

Is there any way to recover the field or will it be exposed in future versions?

Thanks beforehand,

Vangelis Sanchoyerto