In SAP, the SICF node (defined in transaction SICF) is used to activate and manage ICF (Internet Communication Framework) services, which includes OData services.
For SAP OData, the SICF node:
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Enables access to OData services over HTTP/S.
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Hosts the service endpoint under the path:
/sap/opu/odata/<service_namespace>/<service_name>/ -
Is required for activating the OData service so it can be consumed externally (e.g., by Fiori apps or third-party tools).
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Controls security and logging settings for service execution.
Example:
To make an OData service available, you must activate its corresponding SICF node in the path:/sap/opu/odata/sap/ZMY_ODATA_SERVICE