Dipende dalle regole di approvvigionamento.
Per chiarire il concetto di consumabile, ti riporto la
documentazione:
In OpenERP, a consumable is a physical product which is treated like a stockable product, with the exception that stock management is not taken into account by the system. You could buy it, deliver it or produce it but OpenERP will always assume that there is enough of it in stock. It never triggers a procurement exception
