Comparing Kernel BAdI and Classical BAdI: Understanding the Differences in SAP Enhancement Frameworks

Kernel BAdI (Business Add-In) and Classical BAdI are two different types of enhancement frameworks provided by SAP. While they serve similar purposes of extending and customizing standard SAP applications, they differ in terms of implementation, flexibility, and compatibility. Here are the details about their differences:

Implementation Approach:
Kernel BAdI: Kernel BAdIs are implemented using modifications to the ABAP kernel. They require changes to the SAP system’s core code, which means that they directly modify the underlying SAP objects.
Classical BAdI: Classical BAdIs are implemented using object-oriented programming (OOP) principles in ABAP. They involve the creation of enhancement spots and enhancement implementations within the standard SAP code.


Kernel BAdI: Since Kernel BAdIs require changes to the core code, they offer higher flexibility in terms of making extensive modifications to the standard SAP behavior. Kernel BAdIs can be used to modify both the input and output of the standard code.
Classical BAdI: Classical BAdIs provide a flexible way to enhance the standard SAP functionality. They allow you to add or replace specific methods within the standard code. However, they are limited to the predefined extension points provided by SAP.


Kernel BAdI: Kernel BAdIs are more tightly coupled with the underlying SAP system. As a result, they may be more prone to compatibility issues during system upgrades or patch implementations. Modifying the core code directly can introduce risks and may require additional effort to adapt the enhancements to new system versions.
Classical BAdI: Classical BAdIs are designed to be more compatible and upgrade-safe. They follow the principles of object-oriented programming and encapsulation, allowing you to implement enhancements without directly modifying the standard code. This makes it easier to maintain and transport enhancements across different system versions.

Usage Scenarios:

Kernel BAdI: Kernel BAdIs are typically used for complex and extensive modifications to the standard SAP behavior. They are suited for cases where the standard functionality needs to be altered significantly or when there is a need to change system-wide behavior.
Classical BAdI: Classical BAdIs are suitable for smaller, specific enhancements within the standard SAP functionality. They are often used to adjust or extend the behavior of a specific application area or a particular business process.

In recent SAP releases, SAP has been encouraging the usage of Classical BAdIs and providing more support for them. Kernel BAdIs are still available but should be used cautiously, considering the potential risks and compatibility issues associated with modifying the core code.

It’s worth noting that the terminology and concepts around BAdIs may evolve over time as SAP continues to develop and enhance its technologies. Therefore, it’s recommended to consult the official SAP documentation for the most up-to-date information and best practices regarding BAdIs.