Ian Stewart informs us that the Add Item chunk works fine with GP10 and GP2010 R2.
Add Item chunk works fine with GP10 and GP2010 R2 « DynamicsGP.ie – Global Insights from Ireland
Sales, Purchasing & InventoryGP 2010GP 10
Archived post from 2011. Dynamics GP and the links it points to have changed since; check current documentation before relying on version-specific steps.