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Enable OData APIs in SAP NetWeaver

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Enable OData APIs in SAP NetWeaver
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Enable OData APIs in SAP NetWeaver

SAP S/4HANA on-premises UI extension (Part 1) - Learn to enable and expose OData services from an SAP S/4HANA on-premises SAP NetWeaver backend system.

You will learn

You will learn how to enable and expose OData services from a SAP NetWeaver backend system, which is the application server for SAP S/4HANA on-premises. The exposed OData services can be used to develop custom UIs using SAPUI5 and SAP Fiori.

Step 1: Check SAP NetWeaver is operational

In this step you will verify that the SAP NetWeaver system you installed in the preceding tutorial is operational.

  1. Open VirtualBox and make sure that your openSUSE VM is started.

  2. Execute su -l npladm to switch to the user npladm. You will be asked for the SAP NetWeaver system password.

  3. Execute sapcontrol -nr 00 -function GetProcessList to check that the processes are running and are all GREEN

    AiE 1
  4. In case it is in a different state, you should make sure all services are stopped, by executing stopsap ALL.

  5. Now start the services again using the command startsap ALL.

  6. Execute sapcontrol -nr 00 -function GetProcessList to check that the processes are running and are all GREEN

    AiE 1
  7. If this doesn’t help, you can restore the VirtualBox snapshot ABAP with License. You should still verify the all processes are GREEN.

Result of Step 1: You have verified that your SAP NetWeaver system is operational.

Step 2: Find and activate OData services

In this step you will learn how to enable an OData service in your SAP NetWeaver / SAP S/4HANA on-premises backend system. You will do this using the ABAP transaction SICF. The Internet Communication Framework (ICF) allows an SAP system to communicate via internet standard protocols (HTTP, HTTPS and SMTP).

  1. Log on to your SAP NetWeaver backend using the SAP Logon application. (Default user is developer; default password is Appl1ance.)

  2. Open transaction SICF.

    Explore OData 2
  3. Keep the default filter (Hierarchy Type: SERVICE) of the SICF editor and click the Execute icon on the Define Service toolbar to open the hierarchy tree of available services.

    Explore OData 3
  4. In the Virtual Hosts/Services column expand tree item default host | sap | opu | odata | sap.

    Explore OData 4

    Note: This location sap/opu/odata/sap is the location where you find OData services as delivered with any SAP NetWeaver AS ABAP. There you also find the OData services from the Reference applications of the Enterprise Procurement Model (EPM), a demonstration data model on which the business cases and challenges of this tutorial are based on. It also contains a Manage Products sample application, which we will use and extend in this tutorial. But first we will look at the underlying OData service of this application.

  5. Select tree item default host | sap | opu | odata | sap | epm_ref_apps_prod_man_srv.

  6. Open right-click context menu.

  7. Make sure that Activate Service is grayed out, which means that the service is already activated.

    Note: If an OData service is not activated you can use this Activate Service to activate it.

    Explore OData 5

Result of Step 2: You have found the OData service epm_ref_apps_prod_man_srv which the Manage Products EPM sample application uses and confirmed that it is activated.

Step 3: Open SAP Gateway client

In this step you will learn about SAP Gateway transactions to explore details of a specific OData services in the SAP NetWeaver back-end. You will use the transaction IWFND/MAINT_SERVICE to search for a specific OData service. For the found OData service you open the SAP Gateway Client that provides a REST client tool, specialized for testing OData services.

  1. In your SAP GUI

    • Enter /n/IWFND/MAINT_SERVICE in the command field and press Enter to open the Activate and Maintain Services transaction.
    OData Details 2
  2. Click Filter button in the toolbar of the Activate and Maintain Services page.

    OData Details 3
  3. In the opened Filter for Service Catalog window

    • Enter filter string *PROD* as Technical Service Name
    • Click green accept icon with tooltip Continue.
    OData Details 4

    Result: The Service Catalog table only displays those services that contain PROD in their technical name.

  4. Select the table row of the EPM_REF_APPS_PROD_MAN_SRV service (external service name), which is the same as before found in transaction SICF.

    OData Details 5
  5. Click SAP Gateway Client button in ICF Nodes area at the bottom to explore more details of the selected OData service.
    GW Client 1

Result of Step 3: You have opened the SAP Gateway client for the EPM_REF_APPS_PROD_MAN_SRV service.

Step 4: Explore EPM Manage Products OData service

The OData service EPM_REF_APPS_PROD_MAN_SRV which we explore here offers the data of a Manage Products application. This standard application does not feature information on product ratings, but we were asked by the business department in our company to add the product ratings to the application. So in this step we will check if the OData service contains information on product ratings, which we might use to extend the UI.

In this step you will explore the EPM_REF_APPS_PROD_MAN_SRV OData Service and learn what data it contains.

  1. Click toolbar button Execute to test the GET HTTP response of the OData service EPM_REF_APPS_PROD_MAN_SRV.

    GW Client 2
  2. Click Data Explorer button to get more specific data of this OData service.

    GW Client 3

    Result: The Response is now structured in a service document with entities like Products, Suppliers etc. which the service offers.

    GW Client 4
  3. Click Entity Sets on the main toolbar of the SAP Gateway Client page to get all Entity Sets provided by the OData service.

    GW Client 5
  4. Select the Products entity set and click on the green accept icon

    GW Client 6

    Result: The request URI changed to /sap/opu/odata/sap/EPM_REF_APPS_PROD_MAN_SRV**/Products**, i.e. the Products string was added at the end.

  5. Click toolbar button Execute to get the GET HTTP response of the OData service EPM_REF_APPS_PROD_MAN_SRV but this time specifically for the Products entity set

    GW Client 7
  6. Double-click on any Product (e.g. HT-1000) in the HTTP Response area to see the all properties the service offers for each product.

    GW Client 8

Result of Step 4: By means of the ABAP transaction /IWFND/MAINT_SERVICE and the SAP Gateway Client you have seen how to explore the data of a specific OData service. Especially the Products entity set of the EPM_REF_APPS_PROD_MAN_SRV OData service contains also a property value AverageRating which will be used later.

Step 5: Identify OData service used by SAP Fiori app

In this step you will learn to find out, which OData service is used by a SAP Fiori / SAPUI5 application. To do so, you will take a closer look at the Manage Products application which resides in the SAP Fiori Launchpad (FLP), which is exposed from your SAP NetWeaver / SAP S/4HANA system.

  1. Open S/4HANA FLP by pasting following link in your web browser:

    Web Browser 1
  2. On opened FLP login page enter:

    • User: DEVELOPER
    • Password: Appl1ance
    • Click Log On to enter the FLP (launching Fiori launchpad application the first time could again took some time, just wait.)
    Web Browser 2
  3. Click Manage Products tile on the FLP to open the SAP Fiori reference application in which you can manage products coming from a Enterprise Procurement Model (EPM) defined in SAP NetWeaver AS ABAP back-end.

    Web Browser 3
  4. Open Developer Tools in Google Chrome:

    • Open the Google Chrome menu, by clicking on the 3 dots icon in the in the upper right corner.
    • Select More tools | Developer tools.
    • Keyboard shortcut: Windows: Ctrl + Shift + I / Mac OS: Cmd + Alt + I
    Web Browser 4
  5. On opened developer tools (by default on the right side of the Web browser)

    • Click on Network tab.

      Web Browser 5
    • Enter meta as string in the filter field of the network tab.

    • Click Refresh icon of the Web browser.

    Result: The first entry of the filtered HTTP network requests starts with $metadata? and is the OData service which provides the products data of the Fiori application.

    Web Browser 6
  6. Double-click on row $metadata?sap-documentation=heading&sap-language=EN to open the OData service metadata from the SAP NetWeaver AS ABAP 7.50 server.

    Result: The service response gets displayed in a new browser tab, describing the data model of the EPM_REF_APPS_PROD_MAN_SRV OData service. As before in the SAP Gateway Client you can find in the metadata service output in the Web browser the properties of the product entity, e.g. the Average Rating.

    Web Browser 7

Result of Step 5: You now know how to find out which OData services are used in a SAPUI5 / SAP Fiori application.

You have now successfully completed this tutorial and exposed the EPM_REF_APPS_PROD_MAN_SRV OData service from your SAP NetWeaver system. You may now continue with the next tutorial in this series to learn how to make this service accessible on SAP Cloud Platform: Expose OData services to SAP Cloud Platform

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