In a wholesale business, a sales order is entered once. Availability is checked against real stock rather than yesterday's export, a purchase order is triggered automatically where the item falls below its reorder point, the warehouse picks against the same record, the despatch note and invoice generate from it, and margin on the order is visible the moment it ships. Nobody re-keys anything, and nobody reconciles anything.
In manufacturing, a works order draws on a bill of materials and a routing. Material issues and labour bookings land against the job as they happen, so actual cost against standard is a live figure rather than a month-end exercise. When a customer asks whether a job is profitable, the answer takes seconds.
In construction and contracting, costs post to the contract as commitments before they become invoices. Applications for payment, retentions, subcontractor accounts and valuations all read from the same ledger, so work in progress and cash forecasting stop being a spreadsheet someone maintains privately.
In professional services, time and expenses land against the project as cost, revenue recognition follows the contract terms automatically, and utilisation, project margin and forecast revenue are reported from live data rather than assembled at the end of a quarter.