User input should be validated before it is accepted. Specifically, media identifiers can be used on the "link to existing media object" page that do not exist in the database. This needs to be case sensitive (per previous discussions) so entering "m123" should not be accepted if the ID is actually "M123." It would be nice if the program recognized that the wrong case was used and automatically correct to the correct case.
Individual and family identifiers should work the same.