Vishnu - 2012-03-24

I'm using HL7 2.5.1 latest source from repository.
When i load and parse the message I'm getting only null values for RXA segment.

my code:
            immunizationsDto.When = message.ORDER.RXA.DateTimeStartOfAdministration.Time.GetAsDate();
            immunizationsDto.Amount = message.ORDER.RXA.AdministeredAmount.Value;
            immunizationsDto.Unit = message.ORDER.RXA.AdministeredUnits.Identifier.Value;
            immunizationsDto.LotNumber = message.ORDER.RXA.GetSubstanceLotNumber(0).Value;