Any action taken in respect of a trade by a Commsec customer - outside of trading hours on a trading day - is only acted upon by Commsec at the time it resumes processing those actions at the beginning of the next trading day, which I think is pretty close to 10.00am. I'm pretty sure you are told this - by way of text in a roughly 12 x 6cm "box" appearing on your screen spelling out this process - immediately after you have concluded your instruction. And i'm also pretty sure that although it is all done at that 10.00am time, all at once, it is done in order of receipt of the instruction. Rgds Guata.
