Definition of immediate response please!

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Imported from previous forum

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[ original email was from Bernt Sanden - bernt.sanden@omgroup.com ]
Hi,

I am designing a FIX interface for an all electronic OMS. I have a query about immediate response.

The Order Cancel and Order Cancel Replace messages requires "immediate response" due to
the FIX 4.2 spec.

I need a definition of "immediate response" please.

Regards, Bernt Sandén