Mobile Sales Executives who have access to CRM and Email should logically have access to inventory as well so that when they are with a client, they can immediately access whether or not a part will be delivered sooner rather than later. Tie your back end ERP system together with a custom mobile application that allows a representative to drill down from their order entry form to the individual part to its availability. If the customer requires a part immediately, the Representative will be better prepared to propose an alternate solution or substitution should that particular part be on back order.