Used mainly for download to indicate the method that has created the transfer object.
Source
Name of the web method that constructed the response. Not used for upload.
SourceUTCDateYYYYMMDD
Date the web method performed the extract. Not used for upload.
Description
Normally contains the criteria used for the "GET" method.
ErrorMessage
If there is an error, this contains the error message. This should always be checked after a transfer object is returned.