It looks like MYOB has lost a business transaction - Please HELP!

This issue has occured previously as evidenced in the community with no resolution given, however that was Account Right, this issue has occured to us as we discovered today trying to locate an Invoice in Essentials.

It looks like MYOB has lost a business transaction - help!

Today we think we've identified a transaction that the system has deleted (lost? corrupted?) - all on its little own.

• We have a paper copy of the transaction that was printed, when the invoice was created 28.08.23.  Having been printed from MYOB, we have evidence that the transaction did exist. We have also confirmed that MYOB did indeed send the emails with said missing invoice, to both the client, and ourselves.
• Via the transaction Journal Security Audit report, we can see the invoice being created 28.08.23.
• We can see the invoice being opened and edited a few days later.
• The final entry for the invoice showing in the Journal Security Audit is dated 12.09.23- and it is an Action = System.
• There is are no further appearances of the invoice in the journal report after that date.
• Today, when payment came in, our sales admin was not able to find the invoice in order to apply the payment.
• I have searched in every way we can think of to find out what happened.

1. We have searched via the Sales Register - searching dates from 01/08/2010 to 28/08/2030, so it is not a date issue.   We searched on transaction number, customer PO, value of the invoice and the customer name.
2. We have searched via the Transaction Search - using both the invoice number and the customer PO number.
3. We tried recreating the invoice - but MYOB told us the invoice number was already in use; but if it is - we cannot see it.

This is only one invoice but it puts the whole consistency of the company file into question.

Any suggestions on where else or how else to find out what happened would be gratefully accepted.

We have also logged into Essetnials via a different browser, and NO it is still missing in that browser also!

PLEASE HELP