Ran across a need to pull the approved date (latest) from a requisition export and it seems like something I could run across again so here it is:

<quer:projection alias="Recruiting_Start_Date" xmlns:quer="http://www.taleo.com/ws/integration/query">
  <quer:query projectedClass="Requisition" alias="sqLocation" preventDuplicates="true" pagingsize="1">
    <quer:projections>
      <quer:projection alias="ApproveDate" projectedValueType="string">
        <quer:customFunction name="TO_CHAR">
          <quer:field path="RequisitionEvent,EventDate"/>
          <quer:string>yyyy-MM-dd</quer:string>
        </quer:customFunction>
      </quer:projection>
    </quer:projections>
    <quer:filterings>
      <quer:filtering>
        <quer:equal>
          <quer:field path="Number"/>
          <quer:field ownerQuery="MainQuery" path="Number"/>
        </quer:equal>
      </quer:filtering>
      <quer:filtering>
        <quer:equal>
          <quer:field path="RequisitionEvent,WorkActionNumber"/>
          <quer:string>12</quer:string>
        </quer:equal>
      </quer:filtering>
      <quer:filtering>
        <quer:equal>
          <quer:field path="RequisitionEvent,EventDate"/>
          <quer:query projectedClass="Requisition" alias="sqMotives" preventDuplicates="true" pagingsize="1">
            <quer:subQueries/>
            <quer:projections>
              <quer:projection>
                <quer:maximum>
                  <quer:field path="RequisitionEvent,EventDate"/>
                </quer:maximum>
              </quer:projection>
            </quer:projections>
            <quer:filterings>
              <quer:filtering>
                <quer:equal>
                  <quer:field path="Number"/>
                  <quer:field ownerQuery="MainQuery" path="Number"/>
                </quer:equal>
              </quer:filtering>
              <quer:filtering>
                <quer:equal>
                  <quer:field path="RequisitionEvent,WorkActionNumber"/>
                  <quer:string>12</quer:string>
                </quer:equal>
              </quer:filtering>
            </quer:filterings>
          </quer:query>
        </quer:equal>
      </quer:filtering>
    </quer:filterings>
  </quer:query>
</quer:projection>