I have created a new custom field in the buggs issue type. (Mandatory,single select field.)
After this when you edit for instance a task you get "Some issue types are unavailable due to incompatible field configuration and/or workflow associations." and cannot select tochange it to a bugg.
It can be changed with the "move" wizard.
Is there a way to resolve this so you can change the issue types but the field wont be used by non bug issues.