Lesson

Good morning together... 

Please, only a question for my understanding....

I have a lesson activity. To complete this the student must reach the end of the lesson. 
OK, I understood that I must have a question at the end. So the activity shows completed. But when I am going to the complete report, I am getting " No attempts have been made on this lesson.". So if I add a grade to the lesson, the complete report shows me 100/ 100 passed. But thats not what I am looking for. Is there a chance to show just a "complete" in the complete report ???? Or I have to go over the grade to not get the" No attempts have been made on this lesson" ?? 
Thankful for every help ! THX

Frank