When Horizon creates an acquisitions order by importing a MARC record, Horizon matches the incoming MARC record against any existing Horizon bib records. If the MARC record matches an existing bib record, Horizon ties the PO to the existing bib so that a new bib does not get created when the items are ordered. If the library has set up the import source to create ACQ orders, but to not overlay existing bib records, then when Horizon creates the PO, it uses the ISBN from the imported MARC record rather than the existing MARC record. The assumption is that the imported MARC record best reflects the library's choice from the Vendor's inventory, and that the ISBN on the Vendor-supplied MARC record will be more accurate for that order than whatever ISBN is listed in the catalog bib record.
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