The GP team has been working to build Microsoft Dynamics GP 2015 Feature of the Day: Payment Terms – Transaction Calculation
Microsoft Dynamics GP 2015 Feature of the Day: Payment Terms – Transaction Calculation – Microsoft Dynamics GP Community
Tips & Hidden FeaturesMicrosoft & the GP EcosystemGP 2015
Archived post from 2014. Dynamics GP and the links it points to have changed since; check current documentation before relying on version-specific steps.