In response to firm requests, beginning trade date April 14
th, CME Clearing will ensure that the FIXML attribute "Input Source" (abbreviation
"InptSrc) is provided on all outgoing FIXML messages. In addition, the existing Input Source
value on some FIXML messages will change. These changes will make Input Source more closely conform
to the usage of the Trade ID Source Code (position 146-148) in TREX messages.
The most significant impact to most firms will be that beginning April 14
th the Input Source attribute will be sent on all APS FIXML messages.
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