Position sizing

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Hello! How do I make sure that my Lot checking function is run only once, before a new position opens? 

I really need some help.

[William Roeder]

Nelson Wanyama: How do I make sure that my Lot checking function is run only once, before a new position opens? 

When you decide to open a position, call your function once.

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William Roeder:

When you decide to open a position, call your function once. 

Okay. Thank you