When we submit certain Issue Types (document type, for instance), we have a custom field named, "Related Tech Review" that references the issue where the document was reviewed.
As a post function, I'd like to take the value that's entered in the "Related Tech Review" field and create a link to it. (Link type "Related TR").
I've read postings that discuss creating an issue and linking to it as a post function, but all I want is to grab the value from the custom field and create a link to an existing issue. Ideally, a message would pop up if the "Related Tech Review" field was null or the link couldn't be created for some reason.