How to create custom OData service in S/4HANA Cloud?

[SAPSupport]

Hello Support,
We have a Query regarding a Custom Data Source.
We got a requirement for a Custom Business Scenario in which we have developed Custom CDS for Form Template but it has been observed that it is not possible to make Custom Data Source through CDS.

We tried doing this in Data Source Extensions, but it allows only the addition of fields in existing data sources.

Is there any workaround for making a Completely New Custom Data Source?

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[SAPSupport · Accepted solution]

It's possible to create a custom OData service using ABAP RAP with ADT against the development tenant in a 3-system landscape for S/4HANA Cloud. Please see this documentation for an example:

Developing an OData Service for Simple List Reporting | SAP Help Portal

Thanks,

SAP Support