当VASP发送MM7SubmitReq消息给MMSC成功后，VASP可以发送替换消息，以替换之前所发送给MMSC的消息。具体构建替换消息见4.2.2.3。-when sending news to MM7SubmitReq MMSC successful, Feature replacement can send information to replace before MMSC sent to the news. Construction of the replacement concret