Query related to Stage transitions

My query is on CMMN plan items.
We have a use case in which we are trying to have 2 stages in Case management workflow.

  1. L1 Stage
  2. L2 Stage
    L1 Stage is automatically activated when case execution starts. We want to start L2 Stage when L1 Stage takes transition to Complete state.

In modeler, we are getting only exit transition option.usecase1.cmmn (32.8 KB)

Are we missing something while design our flow or it is a known limitation?