When we have two users creating sales invoices simultaneously invoice numbers are allocated to both users and so when we try to save an invoice we are told the number has already been used.
How can we avoid such invoice number clashes when two or more users are active?
Probably somewhat related to this general method of most dynamic numbers being created on click/when the page is opened but there should be an additional check when the document is saved. I have had this a few times when I have had several tabs open and other invoices have been created in the meantime (all by me, but just saved out of order somehow).