Add warning when processing payment with date out of range
It seems that many banks have this requirement for the ReqdExctnDt to be Max +90 and -5 calendar days and ReqdColltnDt to be -6/-3/-2 days and -28 calendar days.
But as it is not strict rules, I think it should be only a warning (and customizable).
https://wiki.xmldation.com/Support/Nordea/ReqdExctnDt
https://wiki.xmldation.com/Support/Unicredit/Austria/SEPA_Direct_Debit/Requested_Collection_Date