For example, valid numbering schemes can be:
In addition, the characters can be in any order. If a number is used anywhere in the scheme, it will be incremented each time you create a new document. For example, SF-001-IA will become SF-002-IA, SF-003-IA, etc. and 5000 will become 5001, 5002 and so on. Invoices schemes that consist of only letters will not change upon creating a new document.
Helpful Tips: If you were previously using numbers and wish to continue from the last used number, enter the last document number from your old system. The system will automatically create the new new documents with the next number for you. For example, entering SF-756 will result with the next number being SF-757.