A report for customers with text within the "Warning on Sales" field is not currently available. However, if you wish to run a report for these specific customers, you can assign (or create a new) a classification to these customers. Afterward you can run your sales reports or client list report and specify this new (or existing) classification. The results will return customers with the classification from which you can drill down for more information.
Kind regards,
HansaWorld Global Support