It was an S3XT trade. A special sort (S3) of cross-trade (XT) which was probably done at the same price (i.e. not a buy/sell but a 'trade' agreement).
See:
http://www.asx.com.au/documents/pro...es_Procedures_Amendments_due_to_MIRs_AGBs.pdf
http://www.asx.com.au/documents/resources/asx_trade_new_order_types.pdf
