To create a processing purpose within the SAP Customer Data Platform, the mandatory steps include:

Processing purpose definition: This is the core step where the actual purpose for processing personal data is defined.

Inbound data governance: This step ensures that the data being ingested into the system complies with the defined processing purposes.

Outbound data governance: This step ensures that the data being sent out of the system adheres to the processing purposes.

These steps are crucial for complying with regional and local regulations, such as GDPR and CCPA, and for applying privacy and trust to the data streaming into and out of the CDP.

Reference= The information is based on the SAP Customer Data Platform documentation which outlines the process of creating a new processing purpose and configuring inbound and outbound data governance to enforce data governance12.