Can a User Picker field automatically update during transition?

[Ron]

Is it possible to automatically update a User Picker field to a user when that user transitions an issue?

[Alexey Matveev · Accepted solution]

Hello, 

Yes,  it is possible with an additional free add-on. You need to create a post function for the required workflow transition. You can read more about it here

https://confluence.atlassian.com/jira064/how-to-update-custom-field-values-during-workflow-transition-720415925.html

[Ron]

Thank you. I was able to set the post function:

The Functional Approver of the issue will be set to %%CURRENT_USER%%.