iSCSI: Command Sequence Number (Single Connection Session)

["Lakshmi Ramasubramanian" <nramas@windows.microsoft.com>]

On Page 36 in Rev13:
 
"On any given connection, the iSCSI initiator MUST send the commands in
increasing 
order of CmdSN, except for commands that are retransmitted due to digest
error recovery 
and connection recovery."

Targets handle out of order CmdSN on multiple connection sessions as
long as
the CmdSN is within the window (Expected and Max CmdSN). Is there a
reason 
to have the above restriction (commands MUST be sent in increasing order
of CmdSN)
for a SINGLE connection session?

thanks!
 -lakshmi