From the GP Support team comes a Work-around to add description for non-inventoried items in Requisition Management
Work-around to add description for non-inventoried items in Requisition Management – Dynamics GP Support and Services Blog – Microsoft Dynamics GP – Microsoft Dynamics Community
Microsoft & the GP EcosystemSales, Purchasing & Inventory
Archived post from 2013. Dynamics GP and the links it points to have changed since; check current documentation before relying on version-specific steps.