We use the comment field ("Reference" in RE7) to record the decline code for our unsuccessful Recurring Gift Payments - e.g. Insufficient Funds, Stolen Card, etc etc.
We need to be able to filter a List (both Gift and Constituent) by the Gift Comment field, to create a list of Hard Declines (Invalid Card Details) and Soft Declines (Insufficient Funds).
We need this functionality for Constituent Gifts so that this will link to Worlflow Designer and assign a Delinquent donor Workflow :)