I'm working through Jira Admin Foundations 2, and in one of the sections it mentions how Issue type Schemes are used to define what Issue Types are available in a project.
Later in the section ,there is a question about configuring issue types for a Business project, and whether the Bug issue type that comes with Software project tempates can be used in the Business project.
The answer is given as as yes, and states that any of the issue types configured on your Jira instance can be used for any project.
My question is then, why use issue type schemes, if any issue types can be used with any project?