retrieveMostEffectiveMileageRates(Date effectiveDate) Retrieves a list of TravelMileageRate objects whose effective dates are before or equal to the given effectiveDate and the
greatest of effective dates before the date.
Retrieves a list of TravelMileageRate objects whose effective dates are before or equal to the given effectiveDate and the
greatest of effective dates before the date.
Parameters: effectiveDate -