There are duplicate sale invoice numbers created when we have two staff who enter a sales invoice from different pcs at the same time.
For example on PC1, User ABC creates new sales invoice whilst at the same time on PC2, USER XYZ creates new sales invoice. Then either user ABC or XYZ finishes the invoice and clicks create invoice. The system allocates the next invoice number and then the other user finishes and clicks create invoice the system then allocates the exact same invoice number to both invoices.
It appears that there is no error checking code when the create invoice button is clicked.
Also in our version of manager there is no link to go to the forum website.