Getting an error when trying to Update QuickBooks financial
Why this is happening:
Using line item discounts that create decimal quantities on sales receipts
Having decimal quantities on line items in conjunction with Global Discounts on sales receipts
A remote store is selling items that don’t have a quantity, creating negative quantity amounts

How to fix it

Version 2013 and 10

For preexisting transactions causing this issue, please follow these steps:
Locate and flag the reversing receipt based on the receipt number in the error as having been sent to QuickBooks:
Choose Point of Sale > Sales History.
Locate and select the receipt that is causing the error.
Click I Want To at the top of the listing and choose Show Financial Detail.
Select Mark this document as successfully sent and click OK.
Create a journal entry in QuickBooks using the appropriate accounts and amounts to represent the receipt that was causing the error.