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040f or field/subfield defined by library as Source > Create/Edit MARC authority via UI
- Must be NR and required MARC field and subfield . Required field? OR only for certain heading types? Or if you have setup subfield 2 rules? IF 008/position 11 = z
- If multiple or does not exist then Error: Show an error message > Can only have one <<cataloging source (040 field) and only one subfield f value>>.
- If user updates source subfield value then update all linked bib fields
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