Rfc function with table parameter

Hey,
im trying to call a RFC function from Webdynpro where i have to give a table as parameter. When creating the table i following exception:
java.lang.IllegalArgumentException: model object must not be null
     at com.sap.tc.webdynpro.progmodel.context.ModelNodeElement.<init>(ModelNodeElement.java:66)
     at be.vrt.wdp.IPublicPlanning_Validation$IP_Update_TableElement.<init>(IPublicPlanning_Validation.java:3667)
     at be.vrt.wdp.IPublicPlanning_Validation$IContextNode.doCreateElement(IPublicPlanning_Validation.java:87)
     at com.sap.tc.webdynpro.progmodel.context.NodeInfo.createElement(NodeInfo.java:854)
     at com.sap.tc.webdynpro.progmodel.context.Node.createElementInternal(Node.java:1346)
     at com.sap.tc.webdynpro.progmodel.context.Node.createElement(Node.java:1365)
     at be.vrt.Planning_Validation.executeRFC_Z_Whatson_Sap_Update_Transmissio_Input(Planning_Validation.java:265)
The code from Planning_Validation (controller class)
public void executeRFC_Z_Whatson_Sap_Update_Transmissio_Input( java.util.Vector nodes, java.lang.String display_value )
    //@@begin executeRFC_Z_Whatson_Sap_Update_Transmissio_Input()
     Z_Whatson_Sap_Update_Transmiss_Input transmiss = new Z_Whatson_Sap_Update_Transmiss_Input();
     //transmiss.addP_Update_Table(new Zmm_S_Update_Status_Table());
     wdContext.nodeZ_WHATSON_SAP_UPDATE_TRANSMIS().bind(transmiss);
     //wdContext.createP_Update_TableElement(new Zmm_S_Update_Status_Table());
     for (int i = 0; i < nodes.size(); i++){
          String [] node = (String[])nodes.get(i);
          IWDNodeElement el = wdContext.nodeP_Update_Table().createElement();
          el.setAttributeValue("Won_Id", node[0]);
          el.setAttributeValue("Won_Status", node[1]);
          el.setAttributeValue("Display_Status", display_value);
     try {
          // Call remote function
          wdContext.currentZ_WHATSON_SAP_UPDATE_TRANSMISElement().modelObject().execute();
          // synchronise data in context with data in model
          wdContext.nodeOutput().invalidate();
     } catch (WDDynamicRFCExecuteException e) {
          // TODO Auto-generated catch block
          e.printStackTrace();
Line 265 is where i call wdContext.nodeP_Update_Table().createElement();
Any ideas ?
grtz,
Hannes

Hey, thanks .. i managed to solve it
this is the code:
//@@begin javadoc:executeRFC_Z_Whatson_Sap_Update_Transmissio_Input()
/** Declared method. */
//@@end
public void executeRFC_Z_Whatson_Sap_Update_Transmissio_Input( java.util.Vector nodes, java.lang.String display_value )
    //@@begin executeRFC_Z_Whatson_Sap_Update_Transmissio_Input()
     Z_Whatson_Sap_Update_Transmiss_Input transmiss = new Z_Whatson_Sap_Update_Transmiss_Input();
     wdContext.nodeZ_WHATSON_SAP_UPDATE_TRANSMIS().bind(transmiss);
     for (int i = 0; i < nodes.size() ; i++){
          String [] node = (String[])nodes.get(i);
          Zmm_S_Update_Status_Table updEl = new Zmm_S_Update_Status_Table();
          updEl.setWon_Id(node[0]);
          updEl.setWon_Status(node[1]);
          updEl.setDisplay_Status(display_value);
          transmiss.addP_Update_Table(updEl);
     wdComponentAPI.getMessageManager().reportSuccess("wohoo!");
     try {
          // Call remote function
          wdContext.currentZ_WHATSON_SAP_UPDATE_TRANSMISElement().modelObject().execute();
          // synchronise data in context with data in model
          wdContext.nodeOutput().invalidate();
     } catch (WDDynamicRFCExecuteException e) {
          // TODO Auto-generated catch block
          e.printStackTrace();
    //@@end

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