Create Custom Event in SAP S/4HANA Using RAP & Event Mesh

January 22, 2026
Kishore Thutaram
ABAP
0

Introduction

“In this guide, we’ll learn how to create custom event in SAP S/4HANA using RAP and trigger it via SAP Event Mesh with a real-world Sales Order scenario.”

Let’s be honest 😄 — SAP loves silence. You save a Sales Order, SAP nods politely, and nothing else happens.

But what if your Sales Order could talk? 📣 What if, the moment it’s created or updated, it politely taps SAP BTP on the shoulder and says:

“Hey buddy, something just changed. You might want to know this.”

That’s exactly what custom events using RAP do.

In this guide, we’ll learn how to create a custom event in SAP S/4HANA using RAP and trigger it via SAP Event Mesh when a Sales Order Item is saved. No Part A, no Part B, no artificial breaks — just a smooth, logical flow, like a well-written ABAP program 😉.

By the end of this article, you’ll confidently:

Design RAP-based events
Bind them correctly
Trigger them during Sales Order save
Monitor them without panic

So grab your chai ☕ — let’s make SAP a little more chatty.

Scenario

"Send sales order item info to BTP upon sales order Save."

Part A: Event Generation

Step 1: Create a “Root CDS View Entity “with sales order key fields.

Step 2: Create an “Abstract CDS entity” with all the additional sales order fields that are needed to send BTP

Step 3: Crete a “Behaviour definition “with managed and unmanaged save implementation on Root CDS, which is created in the first step.

Provide the Zclass to implement the behaviour methods.

Add an event in behaviour definition ex:SalesOrderCreate_Upd with parameter “Abstract CDS entity”, which is created in the second step.

Step 4: In the behaviour implementation, SAP generates the methods in custom class as below. – No need of any manual additional changes in this step.

Step 5: Create “Event Binding”. Right click on your package and look for event binding like CDS entity creation.

Provide the below details for event binding.

Entity name = “Root Entity”, which is created in first step

Event name = Event name mentioned in behaviour definition

Part B: Trigger the Event

Step 1: Find the appropriate sales order user exit

in this scenario the user exit name is USEREXIT_SAVE_DOCUMENT – it triggers after saving the sales order

Step 2: Implement the below code for Creation and Change of sales order

ASSIGN (‘(SAPMV45A)YVBAP[]’) TO <lft_yvbap>.

    
        *--* Trigger the Event for Creation Mode when Recipient ID is present
      IF iv_mode = ‘H’.
        "
        LOOP AT xvbap INTO DATA(ls_xvbap) WHERE vbeln IS INITIAL AND                                                      zz1_recipeid_sdi  IS NOT INITIAL.

          
          =>raise_salesordupd( salesord_events = VALUE #( ( salesdocument =  vbak-vbeln
                                                                                  salesdocumentitem = ls_xvbap-posnr
                                                          %param = VALUE #( recipientid = ls_xvbap-zz1_recipeid_sdi  ) ) ) ).
        ENDLOOP.
*--* Trigger the Event in change mode where Recipient ID gets updated
      ELSEIF iv_mode = ‘V’.
        LOOP AT xvbap INTO ls_xvbap.
          READ TABLE  ASSIGNING FIELD-SYMBOL() WITH KEY posnr = ls_xvbap-posnr.
          IF sy-subrc EQ 0 AND  IS ASSIGNED.
            IF ls_xvbap-zz1_recipeid_sdi  NE -zz1_recipeid_sdi.

              =>raise_salesordupd( salesord_events = VALUE #( ( salesdocument = vbak-vbeln
                                                                                      salesdocumentitem = ls_xvbap-posnr
                                                              %param = VALUE #( recipientid = ls_xvbap-                  zz1_recipeid_sdi  ) ) ) ).
            ENDIF.
          ENDIF.
        ENDLOOP.
      ENDIF.