MYOB Duplicating Invoice Numbers

Question

When we enter invoices or purchases,  even though i have the warn if duplicate number is ticked for both sales and invoices and the invoice number is set to Auto.  the system seems to duplicate the order number or invoice number.  i have included some examples below

Purchases:

Sales:

Does anyone have any ideas as to why this happens?

Doreen_P · Accepted Answer

Hey @Megan3189,

You’ve done the right thing ticking Warn for Duplicate Invoices and Customer PO numbers and using Auto numbering. Even with that on, numbers can still get doubled‑up in these cases:

* Converting orders/quotes to invoices – there’s a known quirk where the order number can overwrite the invoice sequence, which can push the next invoice backwards and reuse an old number.
* Using the browser instead of the desktop app – the duplicate‑number warning only truly behaves in the desktop version; the browser can ignore that setting and let a duplicate through with no pop‑up.

As a quick tidy-up step, check Setup > Sales Numbering and make sure the next invoice and order numbers look right. That way, the next invoice or purchase will use a fresh number instead of repeating one. And if neither of the reasons above sounds like what’s happening in your file, best to reach out to our team on Live Chat via our virtual assistant, MOCA, or by submitting a support case via My Account so they can dig into your specific examples.

Cheers,

Doreen