Thanks for joining this thread, tanyaor. I'm here to help you figure this out.

QuickBooks Overflow error occurs when one of your accounts has exceeded the maximum value authorized to it. There might be one or more of the following reasons behind the occurrence of this error:

• The account balance of your company or other fields is more than $9,999,999,999,999.99.
• A damaged or corrupted transaction data in your company data.
• In case you convert a large amount on a Group Item to a different large amount, this error may appear by the component item of the group.
• If the inventory has a value larger than the item's number.
• If the format mismatches with the format accepted by the QuickBooks Accounting Software.

For best results, we can resolve this by following the steps outlined in this article: Overflow in QuickBooks Desktop.

Feel free to comment below if you need more help.