Bhai Murtaza,
Two points regarding TATASTEEL chart you posted.
Point#2: Even with your setting, the last bar that pierced the upper BB is a red one followed by a green one which came inside BB. But the book says: "For a Sell/Exit condition during an uptrend, the last bar which pierces the upper BB should be green and followed by a red bar coming inside BB." By this rule, TATASTEEL does not signal a Sell/Exit. Just see the same chart of yours with BB(9, 2). A similar pattern is there on 11-9-09 when a red bar pierced the upper BB followed by a green bar coming inside the BB (on 14-9-09). But the price again went up instead of falling. This also supports my view. We will know exactly what happens only on the next trading day.
Regards
-Anant