In a new post titled Oregon Companies Improve Audit Ability of Microsoft Dynamics GP Gloria Braunschweig offers some great internal control tips for GP.
Oregon Companies Improve Audit Ability of Microsoft Dynamics GP | ERP Software Blog
Fraud, Audit & ControlsMicrosoft & the GP Ecosystem
Archived post from 2013. Dynamics GP and the links it points to have changed since; check current documentation before relying on version-specific steps.