Error occurred while checking for duplicate invoice.
This error is thrown when you do not have the 'Allow Duplicate Invoices to be Approved' setting switched on for your accounts package.
To clear this error, you will need to do the following:
From your company homepage, click the Integrate button on the left hand side:
2. Click the box next to the option 'Allow for Duplicate Invoices to be Approved for Accounting Software' to select it.
3. Click Save!
4. Republish the affected invoice(s).
Once the invoice(s) are successfully published, the error message will clear!