ABAP CDS Views

5 easy steps to extend standard CDS views

04/23/2019

42305

Dear SAP Learners, in the blog post we will learn on how to extend standard CDS Views using Eclipse ABAP Development Tools(ADT).

Given some client/business requirements we may have to extend standard CDS views to add extra fields.

Table of Contents

Also Read: How to find all standard and custom CDS views in the system

CDS View Extensions

A CDS view is extended by creating a new DDL source with DDL statement EXTEND VIEW. As we know for every DDL source we have 2 corresponding dictionary objects created and we call them as DDIC based CDS view:

The CDS View and
SQL View

With S/4HANA 2020, DDIC-based CDS views are deprecated and replaced with ABAP CDS view entity, a new type of CDS view.

So when you extend a CDS view, there will be two corresponding objects created:

The CDS view extension and
Append View

Note: CDS view development and extensions is done using Eclipse ABAP Development Tools(ADT). If you have not installed ADT tool, click here to install Eclipse ABAP ADT

Extend Standard CDS Views

Lets see the steps to extend a standard CDS view. In this example I will be using standard CDS view “SEPM_SDDL_SALESORDER_HEAD” and add 3 new fields.

1. Launch the Eclipse ABAP Development Tools.

2. In your ABAP project, select the relevant package in the Project Explorer.

3. Right-click on the package and choose: New – Other ABAP Repository Object – Core Data Services – Data Definition to open the creation wizard.

4. Enter the Name and the Description for the CDS view extension. Choose Next.

5. Assign a transport request, if prompted and choose Next.

6. Select the Extend View template and choose Finish.

7. In DDL source code editor, enter the necessary information for names of the append view, the original CDS view and for the actual view extension like below.

8. In the above CDS view source code, I have extended the view SEPM_SDDL_SALESORDER_HEAD with three new fields:

overall_status,
payment_terms and
payment_method

9. Save and activate the newly created CDS view extension.

10. After successful activation, check the DDL SQL Append View “ZD_EXTENDAPPND” in SE11 transaction.

Additional fields are added to original CDS view using append view.

11. Now that, we have created CDS view extension let’s check the output of the original CDS view using Data Preview and in the CDS view output you can see the data for three new fields is displayed.

Key Notes

A standard CDS view can be extended using multiple CDS view extensions.
The annotation AbapCatalog.viewEnahancementCategory must be specified in ABAP CDS view with any of these values #PROJECTION_LIST, #GROUP_BY and #UNION.
A CDS view with AbapCatalog.viewEnahancementCategory as #NONE cannot be extended.