One Invoice Per Shipment Per Order

If this check box is selected, one invoice will be generated for each order for each shipment when using Order Invoicing. Shipments are only included in invoicing if Create From Shipments is selected on the Order Invoicing/Credit Memo form.

If this check box is cleared, then order lines tied to shipments can be included on invoices with lines that are not on shipments or lines from multiple shipments.