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shortcut prod.inventory instead of product.inventory works
thank you for answer
Steven Parker224,811 Points
The term "prod" is a function parameter. It doesn't represent "product" until the function is called and that is passed as the first argument in the call. And that reference is only valid inside the function.
You could have many other items in the code, but anytime the function is called one of them would need to be named as the argument. Then that other one would be accessed inside the function code as "prod".