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An ERP solves a problem no single department sees. Sales puts the order in its quoting tool, the warehouse in a spreadsheet, purchasing in an email to the supplier, and accounts types it again into the bookkeeping package. Every retype costs time, and every error shows up at year end or with a customer who got the wrong thing. With an ERP everyone works on the same data: when sales enters the order, the warehouse sees what to pick, purchasing sees what to reorder and the invoice is ready to send.
The idea grew out of material planning in 1970s manufacturing. Around 1990 the system for the whole company got the name ERP, and SAP made it big. For smaller firms there are now cloud packages such as Odoo, Microsoft Dynamics 365 Business Central, NetSuite and Sage, all priced per user per month.
Six departments, one order, no retyping
- 1Salesenters the order
- 2Warehousepicks and delivers
- 3Purchasingreorders what is short
- 4Operationsbooks material and hours
- 5Accountingsends the e-invoice
- 6Managementreads the margin
Sketch. Without an ERP every department keeps its own list, and someone types the order three times.
What an ERP costs a team of eight
The licence is rarely the biggest cost. Implementation, meaning configuring your processes, moving your data and training people, often costs more than the first years of licences combined, and it depends far more on your partner than on the software. What that looks like for the most popular open package is covered in Odoo pricing; how long it takes in how long ERP implementation takes.
| Option | Fits | Watch for |
|---|---|---|
| Odoo | Trading, light manufacturing, services, one app at a time | Partner quality decides the result |
| Business Central | Firms already on Microsoft 365, multi-company and multi-currency | Licence tiers per role |
| A custom platform | A trade with rules no package knows | You own the roadmap and the upkeep |
E-invoicing is now part of the brief
Across Europe, structured e-invoicing is becoming law country by country. Belgium made it mandatory between businesses in January 2026. Germany has required every business to receive e-invoices since 2025, with sending mandatory from 2027 for larger firms and from 2028 for all, and the EU's VAT in the Digital Age package extends it to cross-border trade within the EU from July 2030. An ERP that cannot send and receive e-invoices needs an integration; see e-invoicing in Belgium for how the Peppol network works.
When no package fits
Packages work best for standard work. They chafe when your trade has rules nobody wrote software for. For DA Logistics, a haulier, we built a platform that does what an ERP does, but for transport: fuel stock under Belgium's excise rules with first-in-first-out valuation and a customs report, a weekly planning board, the fleet with inspections and policies, staff, pay and costs, and a bundle for the accountant. Around thirty drivers use the app on their phones. The same core went live for Zuco Logistics on 14 September 2026 with its own fuel model. If you are weighing a package against custom work, read build vs buy software and Odoo or custom software.
Choosing an ERP without regrets
- Map one order from enquiry to payment: who does what, in which tool, and where someone retypes.
- Pick the three processes that hurt most and test every package on them, with your own data.
- Ask for implementation in hours, not just the licence per user.
- Check that the package sends and receives e-invoices in the countries you trade with, or which integration it needs.
- Ask how you export all your data if you ever want to leave.
- Let the people who will use it every day test it, not only the managing director.
Before you buy an ERP
Does a small company need an ERP?
A service business without stock often manages with accounting software and a CRM. An ERP pays once you have stock, purchasing or production and several people working on the same data.
What is the difference between ERP and CRM?
A CRM covers customers and sales up to the signature. An ERP runs what comes after: purchasing, stock, production, invoicing and accounting. Many ERPs include a CRM module.
Can an ERP run several companies and currencies?
Most mid-market packages can, Business Central and Odoo included, but intercompany invoicing and consolidation are often extra configuration. Ask to see it working with two of your own entities.