When a limit in circulation is exceeded the librarians have no indication which limit was exceeded. Right now they get a generic warning: "too many checked out, 11 checked out, only 4 are allowed". Ideally the message should be more detailed. For example: "too many checked out, 11 checked out, only 4 items are allowed for patron category 'XXX' and item type 'YYY'"
It's a little more complicated: It could also be the overall limit that was reached, independent of itemtype. So both possibilities would need to be taken into account.