Is there a way to retrieve Exchange Execution ID or to track by that (exists in TWS)? This of course only happens after transacted but should be a solid one.
I agree, this could easily be in the top 5 features on my wishlist, even though with the daily report mail-ins it would merely offer convenience rather than a full blown upgrade. I would even settle for just keeping my api order numbers because with proper math one could chop a few bits to store custom flags and small numbers. Unfortunately it doesn't look possible either.
This is why orderRef (or a similar customer-supplied field) should be int64 instead of string, then no issues with storage.
