Guide : Value Help - SAP Help Portal
As per guide we understand that we can create value helps by creating Custom CDS View with “value help” option.
Question : Can we create Custom CDS value help with combination of Custom business object and standard CDS .
Steps followed :
1. Created custom business object. Create custom CDS view with “Value Help” option
2. Select Custom business object as primary data source ( No data )
3. Standard CDS view as associated data source ( Data Exist ).
Yes, it's possible to create Custom CDS Value Help with Custom Business Object and Standard CDS View. However, you'll need to always follow the prerequisites below:
Feel free to follow the steps that you provided in the case, it should work. For more information you can also check the documentation SAP Help - Adding a Value Help with the Custom CDS Views App and the SAP Blog Post. In the SAP Blog Post, you will notice that in the "Fig.2" the Custom CDS View used as example has the Custom Business Object as primary datasource and the standard CDS View associated.