Step 1 – Understanding the Question
The question refers to theSide-by-Side extensibilityconcept in SAP S/4HANA Cloud, which is one of the three extensibility approaches defined by SAP:
In-App extensibility– Extensions made directly inside the SAP S/4HANA system using key-user tools.
Classic extensibility– Custom developments using ABAP in the SAP core system.
Side-by-Side extensibility– Building and running extensionsoutsidethe SAP S/4HANA core on theSAP Business Technology Platform (BTP).
Step 2 – Evaluate Each Option
A. Extending SAP S/4HANA using SAP ABAP Development Workbench
This isclassic extensibility, not Side-by-Side.
It modifies the core ABAP stack directly, which contradicts the clean-core principle for cloud environments.
Result:Incorrect.
B. Extend SAP S/4HANA using APIs published on SAP Business Accelerator Hub
Side-by-Side extensibility leveragesSAP BTPfor building external applications and services that communicate with SAP S/4HANA usingstandard APIs and events.
The APIs used for these extensions are published on theSAP Business Accelerator Hub(formerly API Business Hub).
This approach allows creating custom UIs, workflows, or integrations without modifying the core system.
Result:Correct – This defines the Side-by-Side extensibility model.
C. There are two SAP S/4HANA instances: one for standard code and another for custom developments
SAP does not create a separate instance for custom code in Side-by-Side extensibility.
Extensions are builtexternally on SAP BTP, not as a second SAP S/4HANA instance.
Result:Incorrect.
D. SAP S/4HANA extensions are context-aware and focused on tight integration
This describes theIn-App extensibilitymodel, where extensions are embedded within the core system and maintain contextual awareness.
Result:Incorrect.
