M3UA : query on RC presence in messages

Hi,
 
is the statement in RFC 3332/4466 sections 3.3.1 (and same for other
messages)
"Where multiple Routing Keys and Routing Contexts are used across a
common association, the Routing Context MUST be sent to identify the
traffic flow, assisting in the internal distribution of Data messages"
relates to both ASP and SGP?
Is it correct for SGP to reply with ERROR upon DATA message without RC
after several RC coordinated? Is it mandatory to send ERROR? Or M3UA
implementation may allow to forward message based on DPC only?
 
Regards,
Lev Finkel
Veraz Networks ltd.

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