Navigate to 'Documents' > 'Maintenance' > 'Transaction Types'.
Under 'Document Types' you will see a list of all available Document Types on your system. The fields "Prefix', 'Last Number' and 'Document Reference Size' all determine how your Documents are numberred.
- Prefix - This the set of Alphabetical characters that will appear at the beginning of the document number.
- Last Number - This was the last number that was generate for that particular document type. This number increases sequentially with each document that is generated.
- Document Reference Size - This is the number of numerical characters that appear in the document number after the prefix.
In the above example for 'Customer Invoice', The next Customer Invoice that is generated will inherit the document number 'INV0000414'