how to set resolution automatically when i set a status

[Avidan Izaks]

Currently we have several issue statuses such as "Cancelled" and "Could Not Reproduce"

We want to set a resolution status automatically for each issue that moves to one of those statuses 

Alternatively. We would like to set up the resolution field mandatory for closing an issue 

[Joe Pitt · Accepted solution]

You can set the resolution in a post function for the ones you want to set a known resolution. The transition to the close status needs to show the resolution fields on the transition screen. Anytime the resolution field is displayed it is a required field. So just putting it on the transition screen will make it required. It should NEVER be places on the create or edit screens. 

[Pete Singleton]

You can set it automatically, by creating a Post Function in the workflow.  For the transition to each Status, create a new post-function of type "Update Issue Field".  Then select Resolution as the field to be updated, and choose the required resolution.