FHIR Slicing on extension with ValueCode as discriminator

Profile careplan

<?xml version="1.0" encoding="UTF-8"?>
<element>
    <path value="CarePlan.activity" />
    <slicing>
        <discriminator value="extension.valueCode" />
        <ordered value="true" />
        <rules value="closed" />
    </slicing>
    <definition>
        <short value="Action to occur as part of plan" />
        <formal value="Identifies a planned action to occur as part of the plan.  For example, a medication to be used, lab tests to perform, self-monitoring, education, etc." />
        <min value="0" />
        <max value="5" />
        <isModifier value="false" />
        <mapping>
            <identity value="rim" />
            <map value=".outboundRelationship[typeCode=COMP].target" />
        </mapping>
    </definition>
</element>
<element>
    <path value="CarePlan.activity" />
    <name value="Opphold" />
    <definition>
        <short value="Action to occur as part of plan" />
        <formal value="Identifies a planned action to occur as part of the plan.  For example, a medication to be used, lab tests to perform, self-monitoring, education, etc." />
        <min value="0" />
        <max value="1" />
        <isModifier value="false" />
        <mapping>
            <identity value="rim" />
            <map value=".outboundRelationship[typeCode=COMP].target" />
        </mapping>
    </definition>
</element>
<element>
    <path value="CarePlan.activity.extension.value/>
    <name value="Code for the Opphold phase of the operation" />
    <definition>
        <short value="Code for the Opphold phase of the operation" />
        <formal value="Code for the Opphold phase of the operation" />
        <min value="1" />
        <max value="1" />
        <valueCode value="Opphold"/> <!-- this is the discriminator -->
        <isModifier value="false" />      
    </definition>
</element>
<element>
    <path value="CarePlan.activity" />
    <name value="Forberedelse" />
    <definition>
        <short value="Action to occur as part of plan" />
        <formal value="Identifies a planned action to occur as part of the plan.  For example, a medication to be used, lab tests to perform, self-monitoring, education, etc." />
        <min value="0" />
        <max value="1" />
        <isModifier value="false" />
        <mapping>
            <identity value="rim" />
            <map value=".outboundRelationship[typeCode=COMP].target" />
        </mapping>
    </definition>
</element>
<element>
    <path value="CarePlan.activity.extension.value/>
        <name value="Code for the Opphold phase of the operation" />
        <definition>
            <short value="Code for the Opphold phase of the operation" />
            <formal value="Code for the Opphold phase of the operation" />
            <min value="1" />
            <max value="1" />
            <valueCode value="Forberedelse"/> <!-- this is the discriminator -->
            <isModifier value="false" />      
        </definition>
</element>
<element>
    <path value="CarePlan.activity" />
    <name value="Anestesi" />
    <definition>
        <short value="Action to occur as part of plan" />
        <formal value="Identifies a planned action to occur as part of the plan.  For example, a medication to be used, lab tests to perform, self-monitoring, education, etc." />
        <min value="0" />
        <max value="1" />
        <isModifier value="false" />
        <mapping>
            <identity value="rim" />
            <map value=".outboundRelationship[typeCode=COMP].target" />
        </mapping>
    </definition>
</element>
<element>
    <path value="CarePlan.activity.extension.value/>
        <name value="Code for the Opphold phase of the operation" />
        <definition>
            <short value="Code for the Opphold phase of the operation" />
            <formal value="Code for the Opphold phase of the operation" />
            <min value="1" />
            <max value="1" />
            <valueCode value="Anestesi"/> <!-- this is the discriminator -->
            <isModifier value="false" />       
        </definition>
</element>
<element>
    <path value="CarePlan.activity" />
    <name value="Knivtid" />
    <definition>
        <short value="Action to occur as part of plan" />
        <formal value="Identifies a planned action to occur as part of the plan.  For example, a medication to be used, lab tests to perform, self-monitoring, education, etc." />
        <min value="0" />
        <max value="1" />
        <isModifier value="false" />  
        <mapping>
            <identity value="rim" />
            <map value=".outboundRelationship[typeCode=COMP].target" />
        </mapping>
    </definition>
</element>
<element>
    <path value="CarePlan.activity.extension.value />
        <name value="Code for the Opphold phase of the operation" />
        <definition>
            <short value="Code for the Opphold phase of the operation" />
            <formal value="Code for the Opphold phase of the operation" />
            <min value="1" />
            <max value="1" />
            <valueCode value="Knivtid"/> <!-- this is the discriminator -->
            <isModifier value="false" />            
        </definition>
</element>
<element>
    <path value="CarePlan.activity" />
    <name value="Transport" />
    <definition>
        <short value="Action to occur as part of plan" />
        <formal value="Identifies a planned action to occur as part of the plan.  For example, a medication to be used, lab tests to perform, self-monitoring, education, etc." />
        <min value="0" />
        <max value="1" />
        <isModifier value="false" />
        <mapping>
            <identity value="rim" />
            <map value=".outboundRelationship[typeCode=COMP].target" />
        </mapping>
    </definition>
</element>
<element>
    <path value="CarePlan.activity.extension.value />
        <name value="Code for the Opphold phase of the operation" />
        <definition>
            <short value="Code for the Opphold phase of the operation" />
            <formal value="Code for the Opphold phase of the operation" />
            <min value="1" />
            <max value="1" />
            <valueCode value="Transport"/> <!-- this is the discriminator -->
            <isModifier value="false" />             
        </definition>
</element>