Automation: Allow creating Subtask in a scheduled trigger rule

Current behavior:

When an Automation rule with a scheduled trigger is created, the below error is seen while trying to use the Create issue action to create a Subtask instead of a task:

"Issue type is a sub-task but parent issue key or id not specified. (issuetype)"

This is because the trigger is a scheduled trigger not on any issue, selecting Trigger issue option is also not applicable.

Expected behavior :

A4J should allow creating a Subtask instead of a task.