In the SAP Commerce cache, invalidation works on a product type by invalidating cached Product items updated during the import in all connected SAP Commerce cluster nodes and by invalidating all cached FlexibleSearch results where Product type is included. This ensures that the cache only holds valid data and that the queries return consistent results. The invalidation is not limited to the node where the import is running, nor does it affect all cached FlexibleSearch results from the query results region. Reference: 1

The log message means that the new item type will be created after a system update. The message indicates that the code CarProcessDefinition does not belong to a known type, which means that the item type has not been registered in the system yet. This can happen when a new item type is added to an items.xml file but the system has not been updated to reflect the changes. A system update will create the new item type and its corresponding deployment table. The message does not mean that the new item has been added without specifying a deployment table, that the new deployment table has been added without specifying a new item, or that the Java class associated to the new item is missing. Reference: 2

The benefits of SAP BTP Extensions integration are an analysis layer to capture customer interactions, contexts, and behaviors for future processing and microservices that customize the standard functions of SAP Commerce Cloud without compromising on upgradability. The analysis layer is provided by SAP Commerce Cloud, context-driven services, which is part of SAP BTP Extensions integration. The microservices are provided by SAP Commerce Cloud Extension Pack, which is also part of SAP BTP Extensions integration. SAP BTP Extensions integration does not provide a customization layer for SAP Commerce Cloud that depends on the API Registry module, nor does it provide an alternative and independent application to SAP Commerce Cloud based on the backoffice.