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Unexpected result on strategy with order_target_percent

  • Hi, I am new to bt and learning through the sample codes. I have questions on using order_target_percent where target=1 sometimes will set off unexpected results in the order like this

    The link is a bit old and I have a related but different question. When placing an order like this:

    self.order = self.order_target_percent(data=self.spy, target=1)

    It resulted in a few order canceled/margin/rejected. So I changed target=0.9 and it does better but still has a couple of those results.

    How does order_target_percent calculate the units of share since "1" just means 100% of funds are used for the order? Please correct my understand here - I wonder how to use order_target_percent so that it figures out the cash limits and adjust itself to buy slightly lower number of units of shares rather than resulting in order canceled/margin/rejected?

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