CAA : 怎样释放CATDocumentServices::SaveAsNew() 占用的内存

我现在把CATIA 的document 用CATDocumentServices::SaveAsNew() 重新保存到硬盘上
按照help 所说
The new document is identical to the original except for its UUIDs. The original document, iDocument, remains unchanged.
The new document does not exist in the session,it is just created in a file.
应该不会占用内存，但是，我发现每SaveAsNew 一次就会浪费一块内存，
应该如何释放这些内存。