Avoid print Reminders for Customer in a Credit situation

I would like to know if it is possible to prevent the generation of reminders letters (R03B525/R03B20) when the customer's position is in credit (the amount of credit notes is greater than the amount of invoices). I am running the procedure by setting processing option 7 of the Reminders tab in report R03B525 to 3 (release e.2) and letter is generated despite the position of the customer is in credit (total due -13.639,48).

Please let me know.

Here attached the PDF of the letter generated and the set up of the policy used

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