--- title: How to Create an OData Service and Exposing CDS Views as an OData Service description: When it comes time to create an OData project, there are a few things you’ll need to do. Here’s how to create an OData service. image: https://blog.sap-press.com/hubfs/How%20to%20Create%20an%20OData%20Service%20and%20Exposing%20CDS%20Views%20as%20an%20OData%20Service.png --- [![rheinwerk-sappress-logo-header-1](https://blog.sap-press.com/hubfs/rheinwerk-sappress-logo-header-1.svg)](https://blog.sap-press.com/) [Blog](https://blog.sap-press.com) - Books - Get an overview of our books and courses on every relevant SAP topic. - [Programming](https://sap-press.com/programming/) - [Administration](https://sap-press.com/administration/) - [BI](https://sap-press.com/business-intelligence/) - [Finance](https://sap-press.com/finance-controlling/) - [Logistics](https://sap-press.com/logistics/) - [HR](https://sap-press.com/human-resources/) - [CRM & Sales](https://sap-press.com/marketing-sales/) - [HANA](https://sap-press.com/hana/) - [Introductions](https://sap-press.com/introductions/) - [E-Bites](https://sap-press.com/e-bites/) - [Certification Guides](https://www.sap-press.com/certification-guides/) - [Rheinwerk Courses](https://www.sap-press.com/online-courses/) - Book Subscription - Get unlimited access to all SAP PRESS books! - [SAP PRESS Subscription](https://sap-press.com/subscriptions/) [Programming](https://blog.sap-press.com/tag/programming) # How to Create an OData Service and Exposing CDS Views as an OData Service ![SAP PRESS](https://blog.sap-press.com/hubfs/Twitter_profile_pic.svg) by [SAP PRESS](https://blog.sap-press.com/author/sap-press) When it comes time to create an OData project, there are a few things you’ll need to do. First, however, make sure you’ve created all the required core data services (CDS) views.   Assuming you’ve done that, here’s how to create an [OData](https://blog.sap-press.com/introduction-to-odata-in-sap) service, as well as exposing [CDS views](https://blog.sap-press.com/abap-sql-versus-cds-views-and-amdps-what-to-use#cds-views) as a service.   ## Creating the OData Project For this, go to Transaction SEGW, click on the **Create Project** icon, and name the OData project (in this case, we’re naming it “Z\_PurchDocsOVP”).   Now we need to add our CDS views into the OData project: 1. Expand the OData project tree structure. 2. Right-click on **Data Model,** and choose **Reference** \_ **Data Source** (as shown in the first figure). 3. Add our first CDS view for the filter bar Z\_C\_PurchaseDocumentFiltersOVP. 4. Click **Next** and then click **Finish** to add the CDS view to the project. ![Add Data Source](https://blog.sap-press.com/hubfs/05_004-1.jpg)   ## Adding Overview Page Card CDS Views into the Project With the OData project created, now it’s time to add our CDS views for the OVP cards into the project. To do so, click on the **Add CDS-Entity** button at the top of the screen, and add the remaining CDS views one by one as shown in the following figure.   ![SAP Gateway Service Builder](https://blog.sap-press.com/hubfs/05_005.jpg)   Now click on the **Generate** icon on the toolbar, and click on **Continue** in the popup window, as shown in the next figure.   ![Defining the Model and Service](https://blog.sap-press.com/hubfs/05_006.jpg)   On the next popup window, you can either save it into your package or as a local object (in this case, we save it as a local object). After you’ve generated the project, you’ll notice a few green checkmarks against the three CDS views in the project.   ![Saving as Local Object](https://blog.sap-press.com/hubfs/05_007.jpg)   You’ll notice that two of them are checked against **Z\_C\_PriorityVH** and **Z\_C\_StatusVH**—this is because the programmer added value helps in the code, allowing filtering. The framework automatically detected these views as value helps and marked them. The third CDS view with the checkmark is for **Z\_C\_PurchaseDocumentOVP** because the metadata extensions for the CDS view contain analytical annotations for the charts.   After the OData project is generated, we need to register the OData service so that we can use it in SAP Business Application Studio to generate the OVP application.   ## Importing the OData Service Execute Transaction /n/IWFND/MAINT\_SERVICE on the SAP Gateway hub system. Click on the **Add Service** button, as shown in the figure below.   ![Importing OData Service](https://blog.sap-press.com/hubfs/05_008.jpg)   ## Registering the OData Service In the next screen shown in the final figure, enter the **System Alias** as “Local” because your OData project is being registered on the same system. If you want to register the service in another SAP Gateway system, then enter the respective system alias. Enter the project name “Z\_PURCHDOCSOVP\*” or the name you’ve given for your project into the **External Service Name** field and press (Enter).   You should see your OData service ending with \_SRV. Select the checkbox next to the service name, and click the **Add Selected Services** button. Click **Continue** on the popup window and the subsequent pop ups asking for confirmation.   ![Registering OData Service](https://blog.sap-press.com/hubfs/05_009.jpg) ## Conclusion Knowing how to create an OData service is an important step in ABAP development. 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