> 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/troubleshooting.md).

# Find and resolve a problem

Start with the message you see. Confirm tax review only after the item's origin, classification and evidence have actually been reviewed.

## Configuration check reports an error

1. Open **Margin Tax Setup → Actions → Check Configuration**; German: **SOU Differenzbesteuerung Einrichtung → Aktionen → Einrichtung prüfen**.
2. Read the missing prerequisite, such as a posting group, account, dated VAT configuration or reviewed invoice output.
3. Correct that setting with finance or your administrator.
4. Run the check again. [Setup with screenshots](/differenzbesteuerung/differenzbesteuerung_en_us/configure/setup.md).

**Result:** The check reports no outstanding prerequisite. Enable the app only after the responsible finance team approves it.

## A line shows “Prüfung erforderlich”

This means **review required**. Acquisition details have not yet been fully assessed. An item flag alone is insufficient.

1. Open the affected item line and scroll to the margin tax fields.
2. Review acquisition origin, tax classification, goods assessment and goods evidence.
3. Confirm tax applicability reviewed only after the actual review. [Numbered field guide](/differenzbesteuerung/differenzbesteuerung_en_us/work/quickstart.md).

## The sale cannot find a matching acquisition

1. Check that the purchase was posted and appears under **Acquisitions** (**Warenzugänge**).
2. Compare item, actual item application and any serial/lot number.
3. Check **Appl.-to Item Entry** (**Ausgleich mit Artikelposten**) and the available complete-item quantity. Following a transfer, the actual current receipt must match.
4. Review again before posting. Selecting an arbitrary replacement reference does not establish origin.

## Amounts differ from the example

1. Check purchase price, sales price, quantity and the rate valid for the actual supply date.
2. Check returns and price credits already posted against the source.
3. Compare **Fiscal Entries**, acquisition reference and linked item, G/L and VAT entries. [Worked example and result screenshot](/differenzbesteuerung/differenzbesteuerung_en_us/work/quickstart.md).
4. Do not edit posted evidence directly. Use a referenced correction document.

## The customer document is missing information or exposes internal values

Check the report selection and actual invoice/credit memo layout. Do not approve the incorrect layout for sending. **Invoice Output Reviewed** does not replace testing the layout actually used. [Test layouts](/differenzbesteuerung/differenzbesteuerung_en_us/configure/setup.md).

## I receive a permission error

Note the object, action and full message. Ask your administrator to compare the assigned role with the [permission prerequisites](/differenzbesteuerung/differenzbesteuerung_en_us/start/installation.md). Granting general administrator access does not prove the workflow works for the intended user role.

## The contact form does not appear

[Open the support form in a separate window](https://assets-eur.mkt.dynamics.com/4fdafba7-58a0-439d-ac40-8b9307b6aa29/digitalassets/standaloneforms/26148488-e600-f111-8407-7ced8d493772). If that also fails, use the [general solutioo contact page](https://www.solutioo.de/kontakt/).

## The issue persists

Open [Support with contact form](/differenzbesteuerung/differenzbesteuerung_en_us/help/support.md). That page includes a template for the information needed to investigate.


---

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