Warning on Date Field for SOP Goods Despatched/POP Goods Received

If you use Transaction Date Validation, you want to try and stop people processing on particular dates. In particular this setting relates to transactions hitting the nominal ledger. A customer has requested that it should still warn you on processing Goods Despatched or Received if using a date that's unacceptable. I know it will warn on Print Invoice, for example, but a warning would be good.