> 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/help/faq.md).

# FAQ and known limitations

## Is every item marked for margin taxation eligible?

No. The flag is a default. Origin, goods classification and acquisition evidence are reviewed for each acquisition. An industry template does not replace that review.

## Why does a document line show zero percent?

The technical document posting group represents gross consideration. VAT on the positive margin is posted separately. Do not additionally report the gross amount as VAT-exempt turnover.

## Why can I not change a posted tax flag?

The app protects original evidence. Use referenced credit memos and revisions. Changing the item card does not change earlier posted documents.

## Can I use Excel to import fiscal evidence back?

There is no generally approved third-party legacy-data import. Exports support analysis and evidence. Do not change fiscal entries through generic import tools.

## What should I check for electronic invoices?

The app provides structured output in Peppol and XRechnung formats. During setup, check the output and delivery route you use. Custom layouts and integrations require appropriate configuration. Internal purchase prices and margins must not appear on the customer document. [Set up invoice output](/differenzbesteuerung/differenzbesteuerung_en_us/configure/setup.md).

## How do I get the app?

[Contact solutioo directly](/differenzbesteuerung/differenzbesteuerung_en_us/start/licensing.md). We will discuss your needs and prepare a quote for using and setting up the app.

## Where are the margin tax fields?

Open the purchase or sales line, enlarge the line area using focus mode and scroll horizontally to the right. Depending on the profile, show additional fields through personalization. The [quickstart](/differenzbesteuerung/differenzbesteuerung_en_us/work/quickstart.md) marks the controls with numbers.

## How do I contact support?

Use the embedded Dynamics CRM form on the [support page](/differenzbesteuerung/differenzbesteuerung_en_us/help/support.md). Start the subject with “Margin Tax” and include versions and the full error message.


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