[amibroker] How to control PositionSize correctly?

["melticemelt" <melticemelt@xxxxxxxxxxxx>]

I have tried what I can do to control PositionSize but it still work 
wrong. I just want to set PositionSize to 4. I tested PositionSize in 
negative value and also get wrong contract sizing. It often jump from 
high contract size to low and then jump back and so on ...

http://alumni.csie.ncu.edu.tw/~meltice/tmp/PositionSize.PNG
Initial Equity is high enough
MarginDeposit is only 90000
why contract size is not fix to 4 on backtest result










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