如何基于创建服务

　　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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