Systems and methods are provide for optimizing the result of an availability check of a required quantity of products, wherein a plurality of rounding algorithms are provided. In one embodiment, a method is provided that comprises a first step of rounding, according to at least one predetermined rounding algorithm, the required quantity of products. The method may also comprise a second step of checking availability of the rounded quantity of products and a third step of rounding down, according to the at least one predetermined rounding algorithm, the available quantity of products if the available quantity of products is lower than the rounded required quantity of products.