hi..
I see there is a lot of confusion regarding btst. technically if one buys a share & sells it the next day ,there should not be a problem, but what happens at times in such cases is that when one buys shares on day1, and receives the shares short from the exchange,the exchange has a mechanism of 'auction' through which u will get ur shares.
But as is the case here, u have already sold the shares on day 2. now u will have 2 deliver shares before u can receive ur shares from 'auction'.therefore, the shares that u have sold also go in 'auction'.
a very simple solution to this problem is that when u choose a share for btst, continue doing btst in that same scrip for 2-3 days, ie. u sell the share in the morning and buy it back the same afternoon for btst again. this way u do not have 2 give any delivery. after 3 days u can check ur account and then leave the delivery anytime u choose to.
furthar, u should not be charged delivery brokerage from day 2 onwards till the time u leave delivery because u r selling short in the morning and covering the same scrip in the afternoon.