Service Master Implementation Development

Hi Experts,

I have a requirement for Service Master Implementation. In RFx Line Item tab, if we add any material from Add Material Button, the item type should

change from Material to Services. I am using below code for this but no luck. Can you please suggest any alternative for this ?

import com.sap.eso.api.contracts.LineItemIBeanIfc;

import com.sap.eso.api.doccommon.lineitem.LineItemTypeEnumType;

ma_line_items = doc.getLineItems() ;

iterator iter = ma_line_items.iterator();

while(iter.hasNext())

{

     line_item = iter.next();

     mat_obj = line_item.getMaterialObjRef();

     matHome = IBeanHomeLocator.lookup(session, mat_obj);

     matBean = matHome.find(mat_obj);

          if(hasValue(matBean)&&matBean.getExtensionField("Is_Service").get(  ))

       {

              line_item.setLineItemTypeEnum(new LineItemTypeEnumType(2));

            }

}