Request that uses both calculated and ordered dosage (id = "medrx003")

<?xml version="1.0" encoding="UTF-8"?>

<MedicationRequest xmlns="http://hl7.org/fhir">
  <id value="medrx003"/> 
  <identifier> 
    <use value="official"/> 
    <system value="http://www.bmc.nl/portal/prescriptions"/> 
    <value value="12345689"/> 
  </identifier> 
  <status value="completed"/> 
  <intent value="order"/> 
  <medication> 
    <concept> 
      <coding> 
        <system value="http://snomed.info/sct"/> 
        <code value="80582002"/> 
        <display value="Glycerol (substance)"/> 
      </coding> 
    </concept> 
  </medication> 
  <subject> 
    <!--   Linked to the resource patient who needs the medication   -->
    <reference value="Patient/pat1"/> 
    <display value="Donald Duck"/> 
  </subject> 
  <authoredOn value="2015-01-15"/> 
  <requester> 
    <reference value="Practitioner/f007"/> 
    <display value="Patrick Pump"/> 
  </requester> 
  <dosageInstruction> 
    <sequence value="1"/> 
    <text value="1800 mg (1000 mg/m2) orally twice daily from days 1-14 of cycle"/> 
    <doseAndRate> 
      <type> 
        <coding> 
          <system value="http://terminology.hl7.org/CodeSystem/dose-rate-type"/> 
          <code value="calculated"/> 
          <display value="Calculated"/> 
        </coding> 
      </type> 
      <doseQuantity> 
        <value value="1800"/> 
        <unit value="mg/m2"/> 
        <system value="http://unitsofmeasure.org"/> 
        <code value="mg/m2"/> 
      </doseQuantity> 
    </doseAndRate> 
    <doseAndRate> 
      <type> 
        <coding> 
          <system value="http://terminology.hl7.org/CodeSystem/dose-rate-type"/> 
          <code value="ordered"/> 
          <display value="ordered"/> 
        </coding> 
      </type> 
      <doseQuantity> 
        <value value="1000"/> 
        <unit value="mg"/> 
        <system value="http://unitsofmeasure.org"/> 
        <code value="mg"/> 
      </doseQuantity> 
    </doseAndRate> 
  </dosageInstruction> 
</MedicationRequest>