[SOLVED] Responsible can't be changed for tickets with configuration to product

Hello,

following situation: I created a ticket with assignment to a product within configuration. When creating the ticket I automatically became the responsible for that ticket. Trying to change this was not successful (messing: no changes within ticket). After removing product assignment within configuration I was able to change or clear responsible. As soon as assigning product again I get responsible again.
How do I change responsible when product assigned?

Thanks in advance
Ronny

That setting worked - thank you!