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You can show an alert to an Indexing operator on the Indexing station if some fields have a value different from the one you would need.

To do this, you can configure a desired indexing value using regular expressions: https://help.abbyy.com/en-us/finereaderserver/14/help/idd_fieldproperties

The operator will not be able to accept a document if the field value doesn't match the regular expression.

You can also use a When Document Indexing Is Finished script to show a specific error message: https://help.abbyy.com/en-us/finereaderserver/14/help/idd_documenttype_event_handlers

The script is run on the Indexing station. If you throw an error, it will be shown in a dialogue. For example:

// JScript
if (IndexingResult != IFR_DocumentAccepted) return;
if (Attributes("Field").Value != "Hello") {
throw new Error("Field value must be equal to \"Hello\"");
}