That looks like a custom field.
I think that what you are looking for is at: **Admin panel -> Settings -> System -> Tickets **
Then click on the Queues tab
Click on Open
Click on the Columns tab.
There should (third down from the top) be your "FCP Numbers"
Click the Config button for it.
While I do not have the same columns that you do, it should look something like this
See what is listed as the Primary Data Source on your FCP Numbers.