Custom Events in SAP Event Mesh. Step-by-Step (Part 1 - Create a Custom Event)

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Overview

In this step-by-step guide, we will cover the following:

• How to create a Subtype of a Business Object


• How to create Events for the Business Object


• How to establish the Event Linkage for Change Documents


• Finally, how we can make use of it in our SAP NetWeaver add-on for event enablement

 

Part 1: We will create a custom Event Linkage for a Material Change using transaction SWO1 and SWEC.

Part 2: Now we can make use of it in our SAP NetWeaver add-on for event enablement.

 

Introduction to Part 1

This becomes necessary when the Business Object does not offer the desired event that we want to trigger. A typical example is the change of a material where the "Change Event" is not available by default. Hence, we will proceed with the creation of a subtype that includes the Change Event using the following four steps.

 

Step 1: Find your Business Object

In our case, we aim to trigger a Material Change, which corresponds to the Business Object BUS1001.

Go to transaction SWO1--> "Business Object Repository".

Figure 1 Navigate to the Business Object Repository

There you will find the Business Object under:

Logistics – General --> Logistics Basic Data --> Material Master --> BUS1001

Double-click on BUS1001 to view the default available events.

As we can see there is no Change Event available by default.

Figure 2 Check the events of BUS1001 in SWO1

 

Step 2: Create a subtype of BUS1001

Go to Transaction SWO1 and create a subtype of BUS1001. Maintain the details as illustrated in the accompanying figure.

Figure 3 Creating a subtype in transaction SWO1

 

Step 3: Create a Change Event

1. Click on the "Change" button to review the newly created ZBUS1001 Object. It is now a copy of BUS1001, and we will add our change event here.


2. Select and mark "Events" and then click on the "Create" button.


3. A popup will appear for your new Material Change Event. Maintain the necessary details in the popup.

Figure 4 Create your new Event

 

Figure 5 Now your subtype of BUS1001 should look like this

 

Place your cursor on the event and release it:

Edit -> Change Release Status -> Object Type -> To implemented.
Edit -> Change Release Status -> Object Type Component -> To implemented.

Finally, click on the generate button.

Figure 6 Release it and generate it afterwards

 

Step 4: Event Linkage for Change Documents


Now that we have created our new ZBUS1001 Object Type, the next step is to link it to a change event in the system.

Go to transaction SWEC New Entries.

Add your Object Type that you just generated in the previous step and click on the save button.

Note: We can utilize the Function Module /ASADEV/ACI_CPIDENT_TRANSFER to provide the key of the change document and pass it to the SAP NetWeaver add-on for event enablement. This allows for its usage in data extraction.

Figure 7 Create the Event Linkage for Change Documents

 

Optional Step 5: Field Restrictions

By following the first four steps mentioned above, we have successfully created an Event that will be triggered whenever a change is made to a material.

However, there are cases when we do not want to receive notifications for every single change made to a material. In such cases, we can utilize Field Restrictions to specify the specific events we want to monitor.

This is also done in Transaction SWEC. Choose the Object Type that we created in Step 4 and click on Field Restrictions. In this example, we are only interested in being notified when a Material Group is changed or when the Material is locked. We will exclude notifications for any other changes made to a material. By implementing these restrictions, we will only receive notifications for the defined events, ensuring we are not overwhelmed by irrelevant notifications.

Figure 8 Field Restrictions in SWEC

Conclusion

We have successfully extended a subtype of the Business Object BUS1001 by incorporating a material change through the following actions:

• Create subtype BO in SWO1


• Create an event for our subtype in SWO1


• Linked a change document to the BO event in SWEC

Now that we have completed these steps, we are ready to utilize the SAP NetWeaver add-on for event enablement.

In Part 2 we will ocus on capturing a Material Change and seamlessly transmitting it in real-time to the cloud.

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