> For the complete documentation index, see [llms.txt](https://docs.solutioo.de/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.solutioo.de/differenzbesteuerung/differenzbesteuerung_en_us/start/requirements.md).

# Prerequisites and compatibility

| Area           | Requirement for this version                                                                                                                                                                                          |
| -------------- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| System         | Business Central Online, version 28. For questions about your Business Central version, [contact us](/differenzbesteuerung/differenzbesteuerung_en_us/help/support.md).                                               |
| Transactions   | Documented German domestic transactions and eligible acquisitions without input VAT deduction. The original sale uses supply-based taxation (Sollbesteuerung). Cash-basis taxation (Istbesteuerung) is not supported. |
| Currency       | EUR as local currency, cent rounding and nearest VAT rounding. An additional reporting currency is not supported.                                                                                                     |
| Goods          | One complete object with base quantity 1 per document line. Serial/lot tracking and fixed item application must match the actual object.                                                                              |
| Standard setup | Customers, vendors, items, locations, posting groups, accounts, number series and permitted posting/VAT periods must be configured.                                                                                   |
| Output         | Review the invoice and credit memo layouts and each electronic output route actually used.                                                                                                                            |
| Languages      | German and English user interface and documentation. The supported business scope remains German domestic transactions.                                                                                               |
| Other systems  | No other solutioo app, Shopware connection or middleware is required.                                                                                                                                                 |

International/EU transactions, foreign currency, special acquisitions, new vehicles and arbitrary historical migrations are outside the stated initial scope. Check the goods and acquisition evidence before posting. An industry template does not establish eligibility. See [daily work](/differenzbesteuerung/differenzbesteuerung_en_us/work/daily-work.md) and [known limitations](/differenzbesteuerung/differenzbesteuerung_en_us/help/faq.md).


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