Checkin List Allows duplicate entries

Checkin lists allow one to add the same film more than once, with no indication that this has occurred. It's very hard to think of a good reason for this - why not just post a message, and avoid the duplicate. Furthermore, the edit facility does not allow entries to be sorted in alphabetical order, which makes it very hard to find duplicates there. So the only process is to find the duplicates in the normal list. sorted in alphabetical order, then use the browser find to locate the duplicate entries in the edit list, and delete all but one.