Кхм-кхм!
Это то, что 7-й хелп говорит про @abstract применительно к теме:
Caution Rich text fields are not part of a document until saved. If you want @Abstract to work on additions and changes to the current document, you must first save and then recalculate the document. @Abstract cannot convert rich text to text in a view column.
А этот пассаж оттуда-же, но уже про @text
Rich text conversion does not work in column formulas. Use @Abstract to convert the contents of a rich text field to plain text. Then reference the plain text field in the view. For example, if you add the following code to a hidden computed field called plainText, you can then set the default value of the view column to "plainText" to display the contents of the RTField:
@Abstract([TextOnly];15360;"";"RTField")