Prerequisite
you should have a working CDS view. Refer to this link about how to create CDS view.
Steps
Just add one annotation and re-activate your view:
Take my view for example, the following artifacts are automatically generated during activation.
The MPC class:
After activation you can register the created odata service via tcode /IWFND/MAINT_SERVICE.
Once done, you can test the metadata retrieval via gateway client.
Note: this is just a dummy odata service since there is no other OData related annotation except @OData.publish. Please continue to read if you need to define some model node using OData annotation.
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