SAP Business One is business management software (ERP) designed for small and medium-sized enterprises, sold by the German company SAP SE. As an ERP solution, it aims to automate key business functions in financials, operations, and human resources.

SAP Business One is arranged into 15 functional modules, covering the typical functions in a business organization. The most widely used modules are Financials, Sales Opportunities, Sales – A/R, Purchasing A/P, Business Partners, Banking and Inventory.[2]

• Administration, where setup of the various core settings in the application are done.
• CRM, where common sales employee tasks link to the other modules (NB: The module is purely here for usability and offer no new features of its own) (only SAP 9.3 and higher).
• Financials, where definition of Chart of Account are set up and the core Journal Entries can be created.
• Opportunities, where Lead generation are used to keep track of potential Sales and Purchases.
• Sales - A/R, where the sales flow (Quotation > Order > Delivery > Invoice) are managed.
• Purchasing - A/P, where the purchase flow (Quotation > Order > Delivery > Invoice) are managed.
• Business Partners, where master data of Leads, Customer and Supplier are maintained.
• Banking, where payment of Incoming (sales) and Outgoing (purchase) payments are created.
• Inventory, where master data of goods to be sold/purchased are maintained and their quantity/value in warehouses are tracked.
• Resources, where master data of resources (machines and people) to be used in production are defined (capacity and planning) (only SAP 9.1 and higher).
• Production, where Bill of Materials master data are maintained and Production orders are created.
• Project Management, where you define projects (what you do when) (only SAP 9.2 and higher).
• Material Requirements Planning (MRP), where forecasts of needed items in sales/production are defined in order to make purchase order recommendations.
• Service, where management of service contracts are maintained and service calls are created.
• Human Resources, where employee master data (names, contract information, roles, etc.) are maintained.

Each module handled specific business tasks on its own, but is linked to the other modules where applicable. For instance, an invoice from the billing transaction of Sales & Distribution would pass through to accounting, where it will appear in accounts receivable and cost of goods sold.

Architecture

SAP Business One is a typical Client–server model software product.

• Client software is primarily the SAP Business One client that is a Microsoft Windows-based product that connects to a back-end server. SAP also offer clients for phones and tablets (iOS and Android) that contain a subset of the full features aimed at sales employees.
• Integrate HANA/S4 With Excel.
• Server software is run on either a Microsoft SQL Server database (Windows) or SAP HANA database (Linux).