amibroker formula language(AFL)

I have an afl which needs to be edited and made backtestable. PROPERTIES OF AFL 1. It is an intraday stategy where all the open positions are squared off at the end of the day. 2. It has a trailing stoploss which is atr based, formula for which is given in the attached afl. PROPERTIES OF TRAILING stoploss 1. The trailing stoploss changes in accordance to the formula and condition in the given attached file. 2. The maximum difference between traded price and trailing stoploss should be 0.4% of the traded price. E.G. let us assume buy trade has taken place at Rs. 100/- and the value of the trailing stoploss is Rs. 99/-. But the trailing stoploss should should be 0.4% of the traded price, which is Rs.99.6/-. In other words the maximum loss should not be greater than 0.4%. 3. The strategy is intraday therefore the exit trade takes palce when 1. End time has reached. 2. Trailing stoploss is hit 3. At the end time the sell/cover price should be candle close at 3:15 pm 4. When trailing sl is hit, sell/cove price should be value of trailing stoploss 4. The trailing stoploss should always be:- 1. Below the closing price of the candle if buy trade has taken place 2. Abouve the closing price of the candle if short trade has taken palce Note: in the attached afl, when the length of the candle is big, the value of triling stoploss is above the closing price when the buy trade has taken place which is absurd