Summary

When REST PUT  is made to change the request type of an issue that has a completely different workflow or field configuration is made, the result is a success. This shouldn't be the case as a change like this invalidates the workflow.

Steps to Reproduce

1. Create two workflows with different status
2. Associate issue type separately to the two workflows created above
3. Create two Jira issue and set each request type to the workflows created earlier
4. If you attempt to change the issue type from the UI, it won't be possible.  
5. If you attempt to change the issue type via REST api, the issue type is changed. This shouldn't be possible.

For Example:

PUT https://codebarrel.atlassian.net/rest/api/2/issue/SDD-17/

{
"fields": {"issuetype":{"id":10002}}
}

Expected Results

An error should be returned that this is not possible.

Actual Results

A successful execution is returned.

Workaround

Currently none.