Anon,
As ruselw pointed out, BizTalk only allows you to use “equals” comparisons for correlation; so if you are using the received time of the OT message for correlation to the nearest second, you are likely to get tens of orchestrations, rather than a single orchestration with tens of correlated messages (as a received time of 10:10:10 is different to 10:10:11 for example).
I therefore don’t think what you’re looking to acheive is (IMHO) possible – is there any other correlation properties you can use to acheive the same effect? Can you possibly explain the process behind these messages so we can (possibly) offer an alternative?
Rgds, Nick.