The roofing industry is one of those industries that require the material to be accounted for in more than one units of measurement. The requirements are generally specified in meters or sq.meters. Further, the marketing, sale and applications are all in length (meters) and area (sq.meters). The entire inventory and valuation of stocks is generally carried out in weight (kg ton). This is a very basic requirement of the industry and must be well addressed in the ERP. Generally coil manufacturers sells coils on weight basis. Based on the gauge of the material, the width of the coil and the kind of material, the length of coil is theoretically calculated. The ERP needs to take this into account.