How to set value to Model Node of cardinality 0..N

hi
I am looking for a way to set value to a model node of cardinality 0..N
i imported a WSDL into my applicaion , which has the following Node Structure.
Context
--- ModelNode_Request
      ---ModelNode2_Input
      ---ModleNode3_Roles  [ cardinality 0..n singleton 1..1]
           ****Model_Attribute RoleID     <<<<<<<<<<<<
           ****Model_Attribute SysID      <<<<<<<<<<<<
  ---ModelNode_Response
i tried with the below code  but effort went in vain.
i tried following ways to set the value but , i get Nullpointer expection error.
     wdContext.nodeRequest__SubmitRequest().nodeRequestDetails().nodeRoles().
          currentRolesElement().setRoleId("BASIC");
     wdContext.nodeRequest__SubmitRequest().nodeRequestDetails().nodeRoles().
          currentRolesElement().setSysId("R3_220");
i aslo looked into the forum  https://www.sdn.sap.com/irj/scn/thread?messageID=2035342 but couldnt find any solid solution.
It would be great if some one can throw some snippets on the same.
Thanks
Edited by: RR on Dec 22, 2008 5:48 PM

Hi RR,
As far as i know u can set model nodes and values nodes are different. whats shown in the link is for values node. u should do differently for model node..
    Since this is a model node...u first need to create an object of the node type. then create an arraylist for that and then add values..
try this..
// Create an object for structures in the node to be used
Yweb_Po_Items objPOItems = null; // where Yweb_Po_Items is the structure of the node...
// Create an abstractlist for structures in the RFC node to be used, if u are planning to give single or multiple rows (in node/table) as input to the RFC
AbstractList POObjAbsList = new Yweb_Po_Items.Yweb_Po_Items_List();
objPOItems = new Yweb_Po_Items();
//    /set first set of values
objPOItems.setColumn1(u201Cabcu201D); // here hard codede for example
objPOItems.setColumn2(u201Cabcfghu201D);
// add the object to the abstract list
POObjAbsList.add(objPOItems);
//    /set second set of values
objPOItems.setColumn1(u201Cnewabcu201D);
objPOItems.setColumn2(u201Cnewabcfghu201D);
// add the object to the abstract list again
POObjAbsList.add(objPOItems); // now u got 2 records
// now set the abstractlist to the node in the RFC
objGoodsReceiptPO.setPo_Items_In(POObjAbsList);
Hope this information is useful...
Thanks
Md. Yusuf

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