Which documents are mandatory in the billing process of Service Contracts?

In the billing process of Service Contracts, the billing document is essential as it officially records the transaction and payment for the services rendered. This document includes details about the services provided, pricing, and payment terms, and it serves as a formal request for payment from the customer. It is required to complete the billing process and ensure that proper financial records are maintained.

The billing document request initiates the billing process but does not constitute the final billing itself. It's the billing document that serves as the official completion of billing and is necessary for revenue recognition and tracking within the SAP system. Therefore, while the request is important, it is the billing document that is mandatory to finalize the billing of service contracts.