Allowing inventory levels to fall below zero can lead to unintended consequences, including inflated cost of goods sold (COGS) or variance account figures.
To sell an item before it’s physically in stock, create a sales order. Once you receive the inventory, convert the sales order into an invoice.
NOTE: Sage 50 doesn’t track inventory COGS when inventory is below zero.
Incorrect balance on the Cost of Goods Sold Expense account
How to assign a cost to an inventory item that was never purchased