Double CDs

Hello,
when I scan my CD drive I get the message "The CD is already in your collection" whenever I try to catalog the same CD for the second time. This is of course a useful feature to avoid double entries in the DB.
But in rare cases I bought a CD and cataloged it in OrangeDB - and then at a later time I bought a box with several CDs where the first one is also part of the box. Now I really want to have a "double entry" for this CD but I don't know how to include it. It seems that the FreeDB disc ID is checked (or the Windows disc ID) on the Misc tab of the record properties - which I can't change.
Is there a way to bypass this check and to catalog the second CD?

Thanks for your advice
Titus

Use the "Duplicate Album" from the Tools menu.