Announcement in ACES website is as follows:
"In view of the implementation of the Negative List concept in Service Tax with effect from 1st July, 2012, the return filing cycle of six months (April-September, 2012) has been spilt. This new ST 3 Return will be only for the period April-June, 2012, when Negative List was not introduced. This return is available in offline utility only with view and print facility in online mode. The last date of filing the ST 3 return for the quarter Apr-Jun,2012 has been extended by CBEC up to 25th November, 2012 vide Order No 3/2012 dated 15th October, 2012."