Gina Hoener breaks the good news on How GP 2013 will handle Unit Accounts . I didn’t even think to check my beta copy.
How GP 2013 will handle Unit Accounts | Dynamics University
Off-Topic & MiscellaneousGP 2013
Archived post from 2012. Dynamics GP and the links it points to have changed since; check current documentation before relying on version-specific steps.