Deny a user to make a calendar record in a resource but allow to book it

[S1237896]

Hello,

we have a few calendar resources like rooms and cars. The standard way for a user to book a resource should be that he creates a new meeting and add the resource as a participant. This works fine. But some users add the resources as calender and create entries directly in it. Is there any way to restrict this? To make sure a user can only add a resource to the meeting? 

Regards

Sebastian

[#2]

They only way they can add calendar entries directly is when you have granted them permissions on the resource mailbox/calendar, so just remove said permissions.

[#3]

I have not. I only created these resources. They have their default permissions.