Request that uses both calculated and ordered dosage

{
  "resourceType" : "MedicationRequest",
  "id" : "medrx003",
  "text" : {
    "status" : "generated",
    "div" : "<div xmlns=\"http://www.w3.org/1999/xhtml\"><p><b>Generated Narrative: MedicationRequest</b><a name=\"medrx003\"> </a></p><div style=\"display: inline-block; background-color: #d9e0e7; padding: 6px; margin: 4px; border: 1px solid #8da1b4; border-radius: 5px; line-height: 60%\"><p style=\"margin-bottom: 0px\">Resource MedicationRequest &quot;medrx003&quot; </p></div><p><b>identifier</b>: id:\u00a012345689\u00a0(use:\u00a0OFFICIAL)</p><p><b>status</b>: completed</p><p><b>intent</b>: order</p><h3>Medications</h3><table class=\"grid\"><tr><td style=\"display: none\">-</td><td><b>Concept</b></td></tr><tr><td style=\"display: none\">*</td><td>Glycerin 1800 mg <span style=\"background: LightGoldenRodYellow; margin: 4px; border: 1px solid khaki\"> (<a href=\"https://browser.ihtsdotools.org/\">SNOMED CT</a>#80582002)</span></td></tr></table><p><b>subject</b>: <a href=\"patient-example-a.html\">Patient/pat1: Donald Duck</a> &quot;Donald DUCK&quot;</p><p><b>authoredOn</b>: 2015-01-15</p><p><b>requester</b>: <a href=\"practitioner-example-f007-sh.html\">Practitioner/f007: Patrick Pump</a> &quot;Simone HEPS&quot;</p><blockquote><p><b>dosageInstruction</b></p><p><b>sequence</b>: 1</p><p><b>text</b>: 1800 mg (1000 mg/m2) orally twice daily from days 1-14 of cycle</p><blockquote><p><b>doseAndRate</b></p></blockquote><blockquote><p><b>doseAndRate</b></p></blockquote></blockquote></div>"
  },
  "identifier" : [{
    "use" : "official",
    "system" : "http://www.bmc.nl/portal/prescriptions",
    "value" : "12345689"
  }],
  "status" : "completed",
  "intent" : "order",
  "medication" : {
    "concept" : {
      "coding" : [{
        "system" : "http://snomed.info/sct",
        "code" : "80582002",
        "display" : "Glycerin 1800 mg"
      }]
    }
  },
  "subject" : {
    "reference" : "Patient/pat1",
    "display" : "Donald Duck"
  },
  "authoredOn" : "2015-01-15",
  "requester" : {
    "reference" : "Practitioner/f007",
    "display" : "Patrick Pump"
  },
  "dosageInstruction" : [{
    "sequence" : 1,
    "text" : "1800 mg (1000 mg/m2) orally twice daily from days 1-14 of cycle",
    "doseAndRate" : [{
      "type" : {
        "coding" : [{
          "system" : "http://terminology.hl7.org/CodeSystem/dose-rate-type",
          "code" : "calculated",
          "display" : "Calculated"
        }]
      },
      "doseQuantity" : {
        "value" : 1800,
        "unit" : "mg/m2",
        "system" : "http://unitsofmeasure.org",
        "code" : "mg/m2"
      }
    },
    {
      "type" : {
        "coding" : [{
          "system" : "http://terminology.hl7.org/CodeSystem/dose-rate-type",
          "code" : "ordered",
          "display" : "ordered"
        }]
      },
      "doseQuantity" : {
        "value" : 1000,
        "unit" : "mg",
        "system" : "http://unitsofmeasure.org",
        "code" : "mg"
      }
    }]
  }]
}