In SAP S/4HANA, Customer Master Data is no longer maintained as a standalone object like in ECC. It is managed through the Business Partner (BP) concept, which unifies customer, vendor, and other master data into a single, simplified model.

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.