How to get source payload using MessageID during runtime

Hi Friends

I have a requirement to re-process a successful message from PI as we are receiving an error in its application acknowledgment . For this we are planning to take the source payload of that successful message (for which application acknowledgment is erroneous) and planning to reprocess that as a file again. For this we are in a need to get the source payload using the Message ID, If we have the parent message ID how can I get the source payload of that successful message.