Thanks for your replies. Yes, it was the portfolio amount. I have noticed on a couple prior occasions when playing with the backtesting if I used an incorrect date such as leaving the year field at 2004 instead of 2003 for example on one of the buys and then trying to sell the message would come up. I can understand that, because the program would try to sell shares not bought yet.
However, in the last case I mentioned that didn't happen. I will see if it occurs again and give you the exact particulars of the event.
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