Makes sure to checkout the Q&A on Microsoft Dynamics GP Year-End Release 2015: Fixed Assets
Microsoft Dynamics GP Year-End Release 2015: Fixed Assets – Microsoft Dynamics GP Community
General Ledger & FinancialsYear-End & 1099Microsoft & 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.