Some features used in workflows require associated BAdi implementations. When activating any workflow, if BAdi implementation(s) are required and have not previously been created/selected for that workflow, a message box will appear to create/select the necessary BAdis.
Use the drop-down box to select an existing BAdi, or click the + button to create a new BAdi.
To view BAdis used in a workflow that has already been activated, select Show/Hide BAdis list.