S/4 On Premise - Abap Cloud - recommandations for custom tables

[SylvainA]

Hi,

We are on a S/4 Hana On Premise system, and starting our Clean Core journey for extensibility.

We are wondering what is the recommandation for custom tables in Abap Cloud and with the 3 tiers architecture.

Use case : use a released for cloud badi to add a custom check based on a custom table.

Should we : 

1. Create the custom table in Tier 3, create a CDS View on top of it, and release it for Abap Cloud
2. Create the custom table directly in Tier 1, create a CDS View on top of it in Tiers 1, and release it for Abap Cloud

Thank you

[Aukasz_SaBek]

According to clean core approach extension of table using not standard approach should be done on tier 3. 

More information You can find in sap learning journey : https://learning.sap.com/learning-journeys/practicing-clean-core-extensibility-for-sap-s-4hana-cloud...