[Koha] Why holds on restricted items?

Hi, Does anyone know why I can place a hold on an biblio with items that have use restrictions (952$5 ) ? You can even confirm the hold. So a mail goes out: Waiting for you.,etc. But note that such items cannot be checked out. What would be the use of placing and confirming holds on items you cannot check out? Perhaps I am missing something? Did not see any reference in the manual either. Regards, Marcel