Customer invoices can be created regardless of whether vendor invoices have already been created (and vice versa).

Vendor invoices are created before customer invoices.

The customer invoice cannot be created before the vendor invoice has been maintained or generated by the system. The sales order item remains blocked for billing in the billing due list until a vendor invoice is created. You can perform partial billing for partial deliveries. In this case, the system copies the exact quantity from the vendor invoice.

This option enables you to copy data such as freight costs from the vendor invoice to the customer invoice.

Customer invoices are created before vendor invoices.

You can only use this option if you have activated evaluated receipt settlement (ERS) in SAP ERP materials management.

The vendor invoice cannot be released or generated before the customer invoice has been created. The ERS report checks whether a billing document exists for the orders that were created for the selected purchase orders, and only generates invoices for those items that have already been billed in SAP CRM.

You can create a credit memo for partial quantities billed.