When a communication is sent as a response to communication request, in some cases there might some additional actions that might be triggered which requires more information from the sender. Some examples can be but not limited to...

1. The requested document was not sent but something else was sent.

2. The attachment was corrupted

3. More documents are needed based on the information provided etc

In such cases, usually another communication request can be sent from the requestor. However the implementation guide does not provide a standard as to how to correlate both the communication requests...

It would be good if there was a standard for that