E.g. Orderspace creates INV22 and then when I export to Quickbooks it changes its format to INV"" instead of keeping 22 as the number for the next invoice created in Quickbooks. My current way around the issue to keep manually fixing it.
Let's check why the invoice number was changed after exporting it to QuickBooks, userbrothers.
You need to open the last invoice you've created before you import the transaction. The sequence follows the last number you've entered in QuickBooks.
You may consider checking out the last sequence used on an invoice before uploading transactions. This is to ensure you have the correct one moving forward. Otherwise, you have to manually change the number every time you export.