Symptom
You're not finding the Business Catalog SAP_CORE_BC_EXT_FLEX in the SAP S/4HANA Cloud Development Tenant and you're also not able to use the UI Adaptation feature.
Environment
SAP S/4HANA Cloud (3-System Landscape)
Reproducing the Issue
- Access the SAP S/4HANA Cloud Development Tenant (Client 080).
- Go to Business Catalogs app.
- Search by Business Catalog SAP_CORE_BC_EXT_FLEX
- It cannot be found
or
- Access the SAP S/HANA Cloud Development Tenant (Client 080)
- Go to the app that you want to adapt
- Click on the profile icon
- Adapt UI is not available
Cause
You have a 3-System Landscape which consists on Development System, Quality System and Productive System. The Development System is divided into two different tenants: The Customizing one and the Development one.
For a better undestanding I would like to explain the difference between the Development Tenant and the Customizing Tenant in terms of Extensibility:
Development Tenant (Client 080): This tenant provides access to the SAP S/4HANA Cloud ABAP Environment. In this environment, you can build your own custom developments based on lifecycle-stable SAP objects, this is called Developer Extensibilty.
Customizing Tenant (Client 100): This tenant allows you to create low-code custom developments. This is called Key User Extensibility. The Key User Extensibility is based on applications and features that help you customize applications and their UIs. Using extensibility apps, you can create custom fields, adapt UIs, create data source extensions and implementation descriptions for specific business contexts to enhance predelivered applications that are extensible in order to adapt them to your business needs.
Resolution
It's only possible to Adapt the UI in your Customizing Tenant and transport it to your Quality and Productive Systems.
The purpose of your Development System (Customizing and Development Tenants) is to develop your configurations and then transport them to Quality and Productive Systems. This is the expected flow.
You can use your Customizing Tenant for that and then transport the changes to Quality System using the Export Software Collection. You can check the documentation SAP Help Portal | Publishing UI Changes.
See Also
Adapting SAP Fiori UIs at Runtime - Key User Adaptation | SAP Help Portal
3096740 - How to enable "Adapt UI" button in SAP S/4HANA Cloud - SAP for Me
Keywords
SAP_CORE_BC_EXT_FLEX, business catalogs, business roles, adapt ui, ui adaptation, custom field, not available, customizing, development , KBA , CA-UI5-FL-RTA , SAP UI5 Runtime Adaptation , Problem