SessionScope Variable set in ViewObject, ViewCriteria Expression in ADF

Set the Value:
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operatingUnitId = "3400";
ADFContext.getCurrent().getSessionScope().put("OU", operatingUnitId);

Get the Value in ViewObject:
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adf.context.sessionScope.OU


Source Code:
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<Variable
    Name="bing_orgId"
    Kind="viewcriteria"
    Type="oracle.jbo.domain.Number">
    <TransientExpression
      Name="VariableScript"><![CDATA[adf.context.sessionScope.OU]]></TransientExpression>
    <Properties>
      <SchemaBasedProperties>
        <DISPLAYHINT
          Value="Hide"/>
        <LABEL
          ResId="com.herb.scm.model.evo.PoRequisitionHeadersAllEOVO.bing_orgId_LABEL"/>
      </SchemaBasedProperties>
    </Properties>
  </Variable>