Enterprise 21 ERP’s discrete manufacturing software functionality supports the complex business software requirements of the defense manufacturing industry.  With multi-level bills of material, quality control, serial and warranty number tracking, project accounting, progress billing, product configuration, and engineering change order capabilities, Enterprise 21 is the ideal solution for defense contractors. Discover Enterprise 21. Manufacturing Software Solutions for Defense Manufacturers. Discrete Manufacturing Software Bill of Materials Engineering Change Orders Quality Control Attributed Inventory Serial Number and Warranty Tracking Product Configurator Project Accounting Material Requirements Planning - MRP Available and Capable to Promise Production Scheduling Production Reporting Order Management Inventory Management Warehouse Management Procurement Manufacturing Management Financial Management