add On Order facet
Please work with libraries to determine a way to add an "on order" facet. We ingest all bibliographic records before we receive the physical copies. Library users can also place holds on these "on order" bibliographic records. Library users want to distinguish between "recently received" by the library and "recently ordered" by the library.

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Kristine den Boon commented
This is also important for indicating to patrons whether an item is Unavailable or simply On Order, as the current Availability status for On Order items is Unavailable.
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Courtney Reath commented
Placing holds on "on order" items is widely used at my library, especially for popular/in-high-demand titles.