Sub-task issue type is blocked from removal even though there are no sub-tasks

[Geoffrey Hoffman]

We no longer wish to use Sub-tasks in Jira. 

I have a project in which I moved all sub-tasks returned by JQL in a batch operation to regular tasks. The bulk operation completed successfully.

I now have zero sub-tasks. I even added one of the available sub-task types and double checked there are none. E.g. 

project = "XYZ" AND type in subTaskIssueTypes() ORDER BY created DESC

Regardless of my inability to see any tasks of type sub-task, Jira is preventing me from removing the sub-task type. The error it is giving is 

There are 3 sub-tasks that will be affected by this change. You must have at least one valid sub-task issue type.

[Nic Brough -Adaptavist-]

Welcome to the Community!

I would guess that the message is accurate.  I think your search is missing the three sub-tasks because it says "project = xyz", but if you take a look at the line under "Modify issue type scheme", you'll see it says "shared by 2 projects".  (I know, there's a lot on screen here, and it doesn't jump out at us, it is easy to miss). 

So my guess is that the other not-xyz project has the three sub-tasks in it, and you'll need to convert or get rid of them before you can change the scheme.

[Geoffrey Hoffman]

Thanks for the clue! Will look at that.