Itunes Match

i have two itunes accounts on different users on the same imac.

one is mine the other is another member of the family. i have subscribed to itunes match, but cannot subscribe the other account as itunes says that the computer is already subscribed and will have to wait 90 days before previous purchases can be added.

i dont get what it means. it is 2 seperate itunes accounts on the same computer. i thought itunes match worked on the info from your account, not on the actual computer itself.

can some one please help as i dont want to subscribe the other account and find out that they have lost all their purchases.

cheers :-)