API reverse cmd question

Can someone PLEASE indicate why the following API command failed when an API reverse cmd was issued to close an existing open long position and open a new short position on the same forex currency pair.



ie.

http://www.collective2.com/cgi-perl/signal.mpl?cmd=reverse&systemid=xxxxxx&pw=yyyyy&instrument=forex&quant=21&symbol=AUDUSD&signalid=705134467&stoploss=0.7974



I tried emailing Mathew a few days ago but he did not respond.