Purcharse orders

I'm glad to see you posting here in QuickBooks Community, @InesBolt. Let me guide you on how you can correct your inventory value to keep your financial data accurate in QuickBooks Online (QBO). 

The Quantity on PO being negative is caused by creating an invoice or sales receipt before entering the corresponding purchase transactions. If you miscounted your physical inventory, especially if the quantity in QuickBooks would be different when the items have been billed. Even though you deleted the Purchase Order (PO), it will show as negative. I'll be providing a screenshot to show you the result. 

To resolve this, make sure the number of items in the invoice doesn't exceed the total number of items in the PO. Or the number of items in the PO must be greater than what you invoiced to your customer.  

Also, you can check out this article as a guide for the detailed steps on fixing negative quantity and what causes negative inventory: Fix negative inventory issues in QuickBooks Online.

For additional references about managing inventory in QBO, check out these articles:

• Adjust inventory quantity on hand in QuickBooks Online.
• Can I track inventory manually in QuickBooks Online?

Feel free to leave a comment below if you have any other questions about inventory management, @InesBolt. I'm always here to help. Have a good day!