Cant stop mail service as reseller

[IgorG]

Guys, I need you help.

Could you please try to reproduce and inform me - is this problem actual for you? I need any feedback from you regarding this problem.
I'm not found any mentions about this problem on forum and I want to know how serious the problem is and how much users does it affect?

STEPS TO REPRODUCE:
Create reseller, grant him all permissions, log in as reseller, create domain with mail hosting, try to disable mail service for this domain.

ACTUAL RESULT:
Panel allows to uncheck 'Activate mail service on domain' checkbox and click OK. No errors are reported.
Mail service is on for domain.
Settings had not changed.

EXPECTED RESULT:
Mail service should be disabled
settings should be changed

Thank you very much for your help and cooperation!