Please add a function for user-specific invoice numbers.
When working from different locations, company files don't allow entering new invoices if the internet drops out at that location or the administrator's, as it reverts to the logged in Administrator. I understand that the idea is to prevent duplicate invoice numbers. This could be solved by using a pre-fix for invoice numbers, e.g. 001/253874, 012/253874. The pre-fix could be assigned to users, so that users in different location can work on the file, independently of an internet connection.
The same would also be useful for other types of transactions.