oracle adf page definition

hi

I have page definition

<pivotTable IterBinding="EmployeesView1Iterator" id="EmployeesView1" xmlns="http://xmlns.oracle.com/adfm/dvt">

      <pivotTableDataMap>

        <columns>

          <data aggregateDuplicates="true" defaultAggregateType="SUM">

            <item value="Salary"/>

          </data>

        </columns>

        <rows>

          <item value="EmployeeId"/>

          <item value="DepartmentId"/>

        </rows>

        <pages/>

        <drills type="INSERT"/>

        <hierarchies>

          <item value="DepartmentId" location="BEFORE">

            <child value="JobId"/>

          </item>

        </hierarchies>

        <sorts>

          <categorySort item="DepartmentId" direction="ASCENDING"/>

        </sorts>

      </pivotTableDataMap>

    </pivotTable>

my question is I want to change or remove drills type (<drills type="INSERT"/>) in page definition with code