It’s not brain surgery that when you sell an item using Sales Order Process, the sales account comes from the sales account set on the inventory item. What’s interesting is that if you enter a negative quantity, the account used is not sales, but the sales return account from the item. Sure, its intuitive when I say it now but it’s not so obvious when you’re trying to figure out where the posting account is coming from.
Weekly Dynamic: Negative SOP Line Distributions
Sales, Purchasing & InventoryTips & Hidden Features
Archived post from 2011. Dynamics GP and the links it points to have changed since; check current documentation before relying on version-specific steps.