Взято отсюда, но на всякий случай, продублирую:
For this example, we will use TVARVC table entry which will decide what process flow/steps executed in Process chain.
4. Step-By-Step Procedure
The guide starts you off by creating a BAdi implementation. This implementation will generate a class which we will use to store our custom functions (implemented as methods) in. When the custom methods are written and activated, we can then reference them in our BAdi implementation. Once linked, we will have them available in the Process Type 'Decision' in Process chain maintenance.
For this example, we will use TVARVC table entry which will decide what process flow/steps executed in Process chain.