SAP Business One is an ERP software platform specifically intended for small and medium-size businesses. SAP Business One is designed with the idea that smaller companies need ERP software to help manage their business, but not the kind of ERP that large and complex organizations need. The SAP Business One software solution integrates working business functions for the whole company, including financial management, purchasing, sales, distribution, customer service management (CRM), inventory management, production, project management and field service. ... SAP Business One is only sold through partners.