How to find out the Group of the Message, in which the Message was send.

Hi all,
 
I'm currently looking for a way to get the sending group of a message (
using the SP_receive function ).
.. i'm NOT looking for the sender .. i'm keen on getting the group to
which the massage uas sent
(SP_multicast, param no 3 )
 
e.G:
 
sender (s1#spread)           receiver(r1#spread)
-------------------------------------------------
connect to spread
joins group G1
                             connect to spread
                             joins group G1
sends message                receives message but "group" is s1#spread
and NOT G1 
  
 
sorry, if the question was already answered in the archive, but due to
proxy restrictions, i'm not able to access the mail archive page.
 
thanks
  Claus

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