Hi LCrowhurst,
I understand that dealing with duplicate invoice numbers can be quite tiresome and slow down your work process. Currently, our system does provide a warning with an exclamation mark when an invoice number is duplicated. But this feature is not available for quotes. Our team is still in the process of enhancing the MYOB business. You can post in our Ideas board for this feature as a suggestion for our developers to monitor and consider for future updates. In the meantime, you might want to consider creating unique quote numbers to avoid duplication.
Feel free to get in touch if you need more help.
Cheers,
Princess