Here is an interesting idea, Enabling PO and Req Workflow at the same time.
Enabling PO and Req Workflow at the same time. – Microsoft Dynamics GP Community
Sales, Purchasing & InventoryInstall, Upgrade & AdminMicrosoft & the GP Ecosystem
Archived post from 2015. Dynamics GP and the links it points to have changed since; check current documentation before relying on version-specific steps.