Result Type: Number, being the stock on hand at the indicated location
Definition: Given the context of a product "p", such as in a
foreach p in product loop, returns the stock on hand for the product referenced by p at the specified location. For the default location, use an empty string as the parameter.
returns the stock on hand for the product referenced by p at location "NY".
Note: Use p.stockonhand to get the total stock on hand across all locations.