in your Harmony aMBSE Deskbook you describe the workflow with white box activity diagrams as a bottom-up approach within architectural design. It is chapter 126.96.36.199. At the end you are mentioning that from the wb activity diagram, I can generate sequence diagrams out of it, similar to the bb approach in the functional analysis. But how does this work?
1. I create a white box activity view with SE-toolkit within functional analysis pkg
2. I copy the activity diagram down to the architecutral design/ wb scenarios pkg
3. I define the swimlanes with the correspondig subsystems
4. I rearrange the activities
Then I want to generate sequence diagrams with SE-toolkit and get live lines corresponding to the subsystems. How does this work and what modelling context/artifacts have to be provided?