To change the format of the numbers SliQ Invoicing assigns to a
new document, e.g. to a new invoice, open the Options dialog by
pressing the Options button in the toolbar.
SliQ will then display the
Make sure the Document Number Format & Prefixes tab is
selected on the Options dialog.
From the dropdown, select the type of number you want to change,
e.g. invoice number or purchase order number.
Change the options for the selected number format as