OneStep Accounting Professional Edition 4.0 is an integrated accounting system for small and medium sized businesses. Modules include general ledger, sales processing (quotation, sales order, delivery order, sales invoice, credit memo and cash sales), purchase processing (orders, receipts, invoices, debits), cash management, inventory management, user management, and report designer. Flexible and user-friendly. Customizable documents formats. Drill-down to source document. Multi-users. New features in version 4 include item categorization for management reporting, enhanced report designing tool and 100+ new reports.