You enter an invoice and see either of the following errors:
These errors occur if the quantity for an item exceeds 9,999,999.99 or if you enter too many numbers to the right of the decimal point.
If you are having an issues with decimal places, take a look at Adjust the number of places to the right of the decimal point in QuickBooks.
If you need to have a quantity of an item in excess of 9,999,999.99, create multiple lines on the invoice for the same item:
If a number is larger than 9,999,999.99, it is normal to receive this message. However, if you are not entering a large number like this and are still receiving this message, you may need to adjust your Regional and Language Options in Windows.