[wsbpel] invalidReply and missingRequest

["Mark Ford" <mark.ford@active-endpoints.com>]

bpws:invalidReply fault and bpws:missingRequest seem to report the same
error

The definitions from Table A.1. Standard Faults are as follows:

invalidReply = Thrown when a reply is sent on a partner link, portType and
operation for which the corresponding receive with the same correlation has
not been carried out.

missingRequest = Thrown when a reply activity cannot be associated with an
incomplete receive activity by matching the partner link, operation and
messageExchange tuple. 

The definition for invalidReply is incorrect since it includes mention of
correlation. The definition for missingRequest is correct. I don't see a
reason for both since they are the same error as far as I can tell. 

Am I missing something here?