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To create a UDS, a client systems must be able to process the following iLink 2 .X message types:



Security Definition Request (tag 35-MsgType=c)

Submitted to CME Globex by customer system to request
creation of user-defined spread.

Security Definition - Accept or Reject (tag 35-MsgType=d)

Sent to customer system by CME Globex upon acceptance or rejection
of Security Definition Request message.

Business Level Reject (tag 35-MsgType=j)

Sent by CME Globex to reject messages at the FIX session level
(e.g., messages with missing or invalid FIX tags) where the message cannot be processed.