CAA创建参数后的删除问题

lanhuyigui

添加参数代码大致如下：
　CATFrmEditor *_FrmEditor = CATFrmEditor::GetCurrentEditor();
  CATDocument *_Document = _FrmEditor -> GetDocument();
  CATInit *pInitOnDocument = NULL ;
  _Document->QueryInterface(IID_CATInit,(void **) &pInitOnDocument);
  CATIPrtContainer *pIPrtContOnDocument = NULL ;
  pIPrtContOnDocument = (CATIPrtContainer*)pInitOnDocument->GetRootContainer("CATIPrtContainer");
  CATICkeParmFactory *pCkeParFact = NULL;
  pIPrtContOnDocument -> QueryInterface(IID_CATICkeParmFactory, (void**) &pCkeParFact);
  CATICkeParm_var spParm = pCkeParFact->CreateLength ("paramLength",0);
  CATCkeGlobalFunctions::GetFunctionFactory()->AddToCurrentParameterSet(spParm);
我用此方法在一个新建的Part文件中添加后参数后在树上可以显示，但是尝试在CATIA删除却提示＂You can delete only the new parameters that you have added to the part.
The parameters created for each feature can be deleted only by deleting the feature itself.＂
如果不通过程序直接在CATIA建的参数都可以删的，请高手指教CAA中有没有其他添加可删除的参数的方法或能删除以上参数的方法．