Amy Walsh tackles the Dynamics GP 2010 Vendor 1099 Details window over at DynamicsCare. On a related note, someone won a copy of the Microsoft Dynamics GP 2010 Cookbook at a recent GPUG event. Later that afternoon they wrote in to say that the book was already useful for them. They need to fix a 1099 issue and the answer was in there. Even if they had bought the book, it would have saved them consult dollars and time to get the issue fixed.
Dynamics GP 2010 Vendor 1099 Details window |DynamicsCare
Year-End & 1099Payables & ReceivablesMicrosoft & the GP EcosystemGP 2010
Archived post from 2011. Dynamics GP and the links it points to have changed since; check current documentation before relying on version-specific steps.