2 iBook accounts with 2 different Apple ID

Hello,

I have a question regarding 2 different iBook accounts.

I have a Macbook Pro with 2 different users (each with Admin rights):

- one of the user is using his US AppleID (iCloud, iTunes and iBooks)

- and the other is using the French Apple ID (with also iBooks, iTunes etc..)

All worked pretty fine until the French user tried to download his French books on iBooks (on the French user accounts with the french Apple ID). He got a message that said "This computer is already associated with an AppleID. If you download past purchase with your AppleID, you cannot auto-download or download past purchases with a different AppleID for 90 days"!!

The user did hit "Cancel" as we dont want to be stuck with only the French account with the french books for 90 days.

Is there a way to access my US books and my friend his french books, all at the same time, using 2 different user accounts on the SAME computer?

Any help would be greatly appreciated,

Thanks in advance

Eric