It is FCPL's practice on multi-disk DVD items to keep all the disks together as a one unit in a single case. These sets are linked to a title/bib record that reflects this. For example, see bib# 1965885 - Glee. Season 1, volume 1, Road to sectionals [DVD]. There are 4 disks in the set. If a customer places a request on this bib record and it is filled by a FCPL copy, they will get all 4 disks at one time. That is what they expect to happen.
However some SJVLS members split up these DVD sets into single-disk cases then link them to the same title/bib# that contains multi-disk items. This can cause problems for the customer. The request could be filled by one of the single-disk items instead of the entire set. So the customer expects to get disks 1-4 and only receives disk 2.
Some jurisdictions are making efforts to correct this problem. However at this point in time, it is still possible one of your customers could be surprised and disappointed when their request arrives with only a single disk instead of the entire series. In the short term, you can help your customer by placing another request for them through Horizon. Either locate another title/bib record that contains only multi-disk items or place an item specific request on a multi-disk item. In the long term, we will continue to work with other SJVLS members to reduce or eliminate the instances where this is occurring.
Since this is a known issue that is being resolved at the cataloging level, there is no need to place a note in Horizon or on the single-disk itself telling the other jurisdiction to fix it. Branch staff receiving the note do not usually have the ability/authority to make the change. These records are being identified in other ways.