GW 5.x Message Properties - Unable to Confirm Delivery

We have an older but functional 5.x POA's running on 3.x/4.x (yes..!)
running accross WAN linked company divisional sites.

One (1) client has recently identified a problem (many others probably
have similar issues but have not noticed or complained to the Help Desk)
when a message is sent requiring a response or acknowledgement; to verify
if the recipient has opened, read and or replied to it they open
the "properties" of the original message, it shows "incomplete
information" although a telephone contact confirms the target
received/opened/replied/accepted invitation or otherwise acted.

Has this been previously reported as I can find no TID on it anywhere
within the Knowledgebase.

Thanks in Advance,

Alan Jay Mazer, CNE/MCSE
amazer@comcar.com
alan.mazer@verizon.net