Can someone, who is using psar in script alert give me the correct code for using psar crossover as filter

Algos, strategies, code
1

I have tried the two shown below.Both of them give wrong alerts in backtesting. Not sure about real time alerts though.

a) CLOSE > PSAR (CLOSE, 0.02, 0.2) AND REF (CLOSE, 1) < REF (PSAR (CLOSE, 0.02, 0.2), 1)

b)CROSSOVER(CLOSE, PSAR(CLOSE,0.02, 0.2))

2

Exit Long

CROSSOVER(CLOSE, PSAR(CLOSE, 0.02, 0.2))

Exit Short

CROSSOVER(PSAR(CLOSE, 0.02, 0.2), CLOSE)

3

Already using this code.When used in backtesting many times the crossover points are not included in backtesting…Though it is clear that the crossover occured. Is it a error only during backtesting or it also occurs while going live…