Finally Currency translation for Microsoft Dynamics GP 2013 data mart is available with CU8
Currency translation for Microsoft Dynamics GP 2013 data mart (CU8 feature) – Dynamics Corporate Performance Management – Site Home – MSDN Blogs
Install, Upgrade & AdminMicrosoft & the GP EcosystemGP 2013
Archived post from 2014. Dynamics GP and the links it points to have changed since; check current documentation before relying on version-specific steps.