Can I make a field required on completion?

[Leo Snetsinger]

We have a field called Product.  When a ticket is created the user entering the ticket may not know how to respond to the field.  However the user doing the work will have the information required to fill in the field.  Therefore we would like to make sure it is filled in upon closing of the ticket.

[Joe Pitt]

JIRA suite utilities and some other plugins will allow you to require fields during a transition which is what you're looking for.