The GP team offers clarification for Dynamics GP 2013 R2: Licensing for Requisitions, Employee Self Service, and Project time
Dynamics GP 2013 R2: Licensing for Requisitions, Employee Self Service, and Project time
Microsoft & 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.