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In this use case, we will create an issue after executing a transition. The summary of this newly created issue will be set from the transition screen.
Issues to be created
Choose Single issue
Choose Selected issue type → Task
Enter the following expression with parsing mode set to Basic text
Add a Update or copy field values post function to the same transition as the Create issue post function.
This post function must be added after the Jira post function Creates issue originally, that is, in the second position.
Choose Current issue
In the popup, choose the value Set field value manually (parser expression)
Set the expression editor to Advanced mode and use the following expression:
Choose Current user