Two type of subtasks. Make subtask A default for issue type A and subtask B for issue type B

[Sunil Yadav]

I have created two issue types viz. User Story and Change Request and two subtasks types viz. User Story Subtask and Change Request subtask. When I create subtask in user story, both the options of subtasks are visible. I want to remove other option or atleast make only one option default so that users will create user story subtasks in user story issue type and change request subtask in change request issue type.
Please guide me. This is very important to avoid manual errors.

[Nic Brough -Adaptavist-]

Jira has no code that makes sub-tasks specific to parent types at all.  If you can create a sub-task in a project, you can create any type under any type of parent.

You'll need to think about code to do this - specifically a validator which can block the user from creating the "wrong" type of issue.

[Michael Arndt]

I'm experiencing this issue as well. 

I can't see how to set this up using validators.

Is there at least a way to setup a default subtask type depending on the parent issue type? 

[Nic Brough -Adaptavist-]

No, you will need to write/script validators that look at the parent issue type and block the sub-task creation if they are of the "wrong" type.