Invoicing

Receipts always work. Invoices, for selling now and collecting later, are optional: switch on Enable invoicing and click Save settings. That brings the Invoice tab to the register, Create Invoice and Request payment, and the Turn into an invoice button on paid receipts.

Default payment terms is the choice already selected on each new invoice: Due on receipt, Net 15, Net 30 or Net 60. It can be changed on any single invoice, and Custom date on the invoice lets you set any due date. To have other terms in the list (Net 45, for example), contact Bibliopolis support.

Turning invoicing off later hides those tools again. Invoices you already made stay in View Sales and on the Open Invoices report, and you can still record payments against them.

Numbering

Receipts and invoices are numbered separately. For each you can set:

• Prefix: the letters in front, SR- and INV- to start with (up to 12 characters).
• Include year: adds the year, as in INV-2026-0001. With the year on, numbering starts again at the starting number each January.
• Digits: how many digits the number has, padded with zeros (0001 has four).
• Starting number: where the count starts. This takes effect only while you have no documents of that kind yet; once numbering has begun, the count carries on from the last number.

The preview under each block shows what the next number will look like. Changing the format never renumbers documents you already have.