How is it possible to limited the links between IssueTypes and SubTasks Types

[Maille Christine]

I have configure my project in that way:

2 IssueTypes

"IT A" and "IT B"

2 SubtasksTypes

"STT1" and "STT2"

Now I would like to restrict the creation of subtasks that way

only possible to create "STT1" from "IT A" or "STT2" from "IT B" no other combination authorized

if for example the user try to create  "STT1" from "IT B" , he shall get an error

It is possible? how?

Thank you in advance for your answer.

C.Maille

[Maille Christine]

Can we do it via a plugin?

[Steven F Behnke]

There is no way to do this out of the box. All sub-task types are avaliable for all standard types in a given project.