Issue with "duplicate" action in Billing - Receivables

Summary:

Hello,

Content (please ensure you mask any confidential information):

The client do every month a recurrent invoice in AR to avoid to create it manually. They take one of the last invoices (sometimes even from far away, last year, with the period obviously closed - I mention this because maybe is relevant - )

But, with the last one, the invoice itself seems to be blocked and they can't do nothing with that:

1. First they try to "complete" the transaction and it didn't load, so they "recharge" the website and did it again
2. If we try to modify any field in the transaction, the system tells you: