Trouble adding double cd's to collection

[Alan H]

Hi Im new to Orange cd so far all is good exept That
Im having a Little trouble adding double cd's as one entry to my collection I have followed what it says in the help about creating a box set but they still will not merge into one entry I still have the 2 which makes it look like an extra cd The album I am having the most trouble with is Fleetwood mac Black magic woman some of the other double cds have merged just fine but this one keeps saying could not creat new boxset as one or more of the albums are already part of a set ? what am I doing wrong