Still another Microsoft Dynamics GP 2013 Service Pack 2 Feature of the Day: Voiding Updates
Microsoft Dynamics GP 2013 Service Pack 2 Feature of the Day: Voiding Updates – Inside Microsoft Dynamics GP
Install, Upgrade & AdminTips & Hidden FeaturesGP 2013
Archived post from 2013. Dynamics GP and the links it points to have changed since; check current documentation before relying on version-specific steps.