[Koha] why is there an alert when i save a subscription

After saving a new subscription,I get the following alert message: You have not accounted for all missing issues. why do i get this -- View this message in context: http://koha.1045719.n5.nabble.com/why-is-there-an-alert-when-i-save-a-subscr... Sent from the Koha - Discuss mailing list archive at Nabble.com.