In SAP SD, the Inquiry Process represents the very first interaction between a customer and an organization in the sales cycle. It helps businesses record customer interest without creating any financial or inventory impact.

A Sales Order in SAP S/4HANA is a legal document that captures a customer’s request to purchase goods

When it comes to managing the Sales and Distribution (SD) process in SAP S/4 HANA, Sales Document Types play a key role. They determine how different kinds of sales transactions are processed from inquiry to order to billing.