src/java.xml.ws/share/classes/com/sun/xml/internal/ws/model/RuntimeModeler.java

@@ -1178,11 +1178,11 @@
                     }
                     WSDLPart p = getPart(new QName(targetNamespace,operationName), partName, Mode.OUT);
                     if(p == null)
                         resRpcParams.put(resRpcParams.size()+10000, param);
                     else
-                        resRpcParams.put(param.getIndex(), param);
+                        resRpcParams.put(p.getIndex(), param);
                 }
             }else{
                 javaMethod.addParameter(param);
             }
         }