WFE...multibagger in the making, Drilling Feb 2017, page-491

Elcorp

ASX and Chi-x are independent markets. The way your order goes into the market depends on your broker. Some will hit ASX first whilst others will hit chi-x first. Sometimes there may only be bids and offers on the ASX whilst at times there may be only Chi-x bids and offers on the screen.

So pretty much if it says ASX the order was executed on the asx. However you can get part filled on both markets if there wasnt enough available on the one market.

Hope that makes sense