Refunded Expense on Credit Card Statement Not Working

Refunded Expense on Credit Card Statement Not Working

On our most recent American Express statement we had several refunds of charges.  The charges were previously posted as expenses from the downloaded American Express statement.  When we try to "Add & Match" the reversed statement charge, the transaction type is listed as Refund/Credit (which is correct), but when we attempt to save it, we get this error message:

This action is not supported for this particular transaction

How do we handle these statement refund credits?