When you try to add a tag, indicator, or subfield to a record, Horizon verifies that the tag is valid for that record or that the indicator or subfield is valid for that tag, according to MARC standards as your system administrator has defined them for your database. Horizon also checks to see if the tag or subfield is repeatable according to your library’s defined MARC standards. (Repeatable fields or subfields can be added multiple times to a record.)
If you add a tag, indicator, or subfield that is not valid or repeatable, and if you have activated Error Checking, Horizon displays a message in the error window telling you that the tag, indicator, or subfield is not valid or is nonrepeatable. Horizon may also display the erroneous information in a different color, depending on your field settings. (For more information, see Choosing Field Options and Activating Error Checking in Records.)
Some invalid or nonrepeatable tags or subfields may be identified as “Fatal.” You cannot save a record if it contains a tag or subfield that violates the terms of its fatal status. (For more information, see “Setting Up or Changing Valid MARC Record Components” in the
If you double‑click an error description in the error window, Horizon moves your insertion pointer to the error in the edit window.
Here is an example of an error message:
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