The verdict in three sentences
A Berlin manufacturer retyping 150 web orders a day into SAP Business One pays the equivalent of one FTE for work a connector does in seconds. A connector at €8,000 to €30,000 excl. VAT syncs orders, stock every 5 minutes, prices and customers, and cuts displayed stockouts by 80 %. The price gap between an off-the-shelf connector and a custom integration comes mostly from error handling and specific pricing rules.
Three architectures, three budgets
2026 ballpark figures for a German industrial SME running SAP Business One with Shopware, Shopify or a custom shop:
| Architecture | Budget excl. VAT | Timeline | Fits when | Limitation |
|---|---|---|---|---|
| Configured off-the-shelf connector | €8,000 to €12,000 + €80 to €250 per month | 4 to 6 weeks | simple pricing, few variants | fixed business rules |
| Adapted off-the-shelf connector | €12,000 to €20,000 | 6 to 10 weeks | customer discounts, several warehouses | vendor dependency |
| Custom middleware (Service Layer API) | €20,000 to €30,000 | 10 to 14 weeks | complex rules, several channels | maintenance to budget |
| Monitoring and alerts | €2,000 to €4,000 | 1 to 2 weeks | all architectures | essential above 50 orders a day |
| Annual maintenance | €1,500 to €5,000 | ongoing | SAP and shop updates | put it in the contract |
| SAP B1 licences for integration users | per partner contract | to check | data access | often forgotten |
The main watch-out is data access: depending on your SAP Business One version and hosting, the Service Layer or DI API may require extra licences or partner work.
What gets synced, and how often
| Flow | Direction | Recommended frequency | Measurable gain |
|---|---|---|---|
| Web orders to SAP | shop to ERP | real time or every 2 minutes | no more retyping, zero typos |
| Available stock | ERP to shop | every 5 minutes | displayed stockouts down 80 % |
| Customer prices and discounts | ERP to shop | hourly or on change | no more disputed price gaps |
| Customer records and credit | both ways | every 15 minutes | accounts over limit blocked |
| Shipping status and tracking | ERP to shop | every 15 minutes | 30 to 40 % fewer "where is my order" calls |
| PDF invoices | ERP to customer portal | daily | fewer requests to accounts |
Error handling defines integration quality: an order rejected by SAP, for a blocked item or unknown customer, must trigger an alert with the reason, a retry queue and a dashboard. Without that, silent errors push the team back to manual entry.
Mini case study
Jonas, IT director of a commercial kitchen equipment maker near Berlin, has his team retype 150 orders a day at 3 minutes each, 7.5 hours daily, about one FTE at €48,000 fully loaded. The site also shows products as available when they are not, causing 40 cancellations a month on a €650 average order. With custom middleware at €24,000 excl. VAT plus €3,500 of monitoring, he moves the FTE to customer service and cuts cancellations to 8 a month. On 32 saved orders at €650 and 30 % margin, the gain is about €6,200 a month, on top of the freed time. Payback in 6 to 7 months.
FAQ
Need a professional website?
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Do we need a new ERP to sell online?
No, SAP Business One connects well to a shop through a connector or its API. Changing ERP costs €50,000 to €200,000 excl. VAT and is only justified for other reasons.
Is a 5-minute sync enough?
For a B2B manufacturer, yes in 95 % of cases. Real time is only worth it for very low-stock, fast-moving items.
Who maintains the connector after SAP updates?
The maintenance contract, €1,500 to €5,000 a year, should cover SAP and shop version upgrades. Plan a regression test at every major update.
How long does a full project take?
Allow 6 to 14 weeks depending on architecture, including 2 weeks of testing in parallel with manual entry to compare results.
Does the connector handle German e-invoicing rules?
Since January 2025 German companies must be able to receive B2B e-invoices, and issuing becomes mandatory in stages through 2027 and 2028. The shop connector does not replace your XRechnung or ZUGFeRD output, but it must pass complete data (VAT ID, addresses) to SAP so invoices are compliant.
Let's scope your project. We audit your SAP Business One and your shop, then propose the right architecture, for an indicative budget of €8,000 to €30,000 excl. VAT and 6 to 14 weeks of work. Detailed quote within 48 h. WhatsApp +221 77 596 93 33.
Mohamed Bah
Fondateur, Kolonell
Passionate about digital and entrepreneurship in Africa, Mohamed has been helping Sénégalese businesses with their digital transformation since 2020. Founder of Kolonell, he believes every SME deserves a professional and accessible online présence.
