Comment 7 for bug 1642926

Control your /etc/heat/policy.json file. Tacker's manual installation guide is a little confusing, problem is about "resource_types:OS::Nova::Flavor": "rule:project_admin" line. Don't change that line, neccessary roles are configured as default so you don't need to change anything. This solved my issue. (I had been changed the rule to role or made some other configuration, so that was the problem.)