I just read through.
http://www.google.com.au/url?sa=t&ct=res&cd=1&url=http%3A%2F%2Fwww.asx.com.au%2Fsupervision%2Frules_guidance%2Fasxl%2Fappendices_to_asx_market_procedures.pdf&ei=fpvER6OWJIiGpASt4OzSDQ&usg=AFQjCNGrD4no47o_0Jv1XBtosDjqogjsVw&sig2=AWpigKe0th46x15XVeyocg
And it seems like this is action taken before an ann. Particularity if the ann in in regards to a takeover bid.