I have a case type stage 1 has 3 assignment and Stage 2 has 2 assignment . scenario 1: I am in stage 2 first assignment, i want to move the case to stage 1 third assignment ( Last assignment executed) scenario2: I am in stage 1 third assignment , i want to move back to stage 1 second assignment. ( Last assignment executed) I want to implement it through dx api or through custom activity to trigger to previous assignment to cover both the scenarios.