According to the routes set on the products of the raw materials, a
procurement may have to be created for the consumed lines of the MO.
A route may also be set on a product category. Before this patch, we
only look for procurement rules for the routes defined on the products
and on its category, ignoring the inherited route of the parent category.
Fortunetaly, we have a computed field on the product model returning
all the routes from the current category, so we use this one in the
search for procurement rules.
A test has been added to show the failure.