1799 ... The Correlation Data is used by the sender of the
1800 Request message to identify which request the Response Message is for when it is received.

1. "The Correlation Data" sounds funny to my ear.
2. This sentence does not flow as well as the related text in Section 4.10.1:

3150 If the Request Message contains a Correlation Data Property, the Responder copies it to the Response
3151 Message and this is used by the receiver of the Response Message to associate the Response Message
3152 with the Request Message.