I'm trying to implement an issue tracking application with Drupal.
I have 4 clients and I want that each one of them will be able to access the site and add an issue. I filter the project ID so any client see only his project issues.
The only thing I don't get how to do is to assign an issue.
In the "Issue" content type I created a "user Reference" filed called "Assign To" (which cause to Rules to send an email to the assigned user).
I want to be able to assign an issue to any client, but I want a client to be able to assign an issue only to me.
How can I do that? If I can't exclude some users from the list (say-by role) - do you have any idea about different way to achieve the "Assign To" functionality?