new task, condition task before is not complete

Hello there,

i want to create a task, which requests a user input, if the task before has not been completed. I thought i use the "exectue when" action before the user input, but i cant find out, how i use the status "not done" or "in work" of the task before as the condition for the next task to start.

Hope you can help me with this.

Cheers,

Mav