In top form looking at SQL: Assigning Microsoft Dynamics GP Users to SSRS Database Roles is Mariano Gomez.
The Dynamics GP Blogster: SQL: Assigning Microsoft Dynamics GP Users to SSRS Database Roles
SQL & DataReporting & BIInstall, Upgrade & Admin
Archived post from 2011. Dynamics GP and the links it points to have changed since; check current documentation before relying on version-specific steps.
