> ## Knowledge Base Index
> Fetch the complete knowledge base index at: https://support.haddock.app/sitemap.xml
> Use this file to discover available pages before exploring further.
> Pure-Markdown content can be obtained by appending a '.md' suffix to the content URLs listed in the sitemap (without the trailing slash).

# Reconciliation FAQ

### What is reconciliation and what is it for?

Reconciliation links **invoices** with **delivery notes**. You can confirm that deliveries are complete before you pay and trace what each invoice covers.

### What is the acceptable difference?

It is the allowed gap between the sum of delivery notes and the invoice total. Change it in **User settings > Preferences > Documents**. haddock uses it when suggesting matches.

### How do I reconcile delivery notes and invoices?

**Recommended reconciliation** — haddock suggests documents from the same supplier with compatible dates and totals within your acceptable difference. See [Reconcile recommended invoices](https://support.haddock.app/en/article/reconcile-recommended-invoices-ta43sd/).

**Manual reconciliation** — pick the invoice and delivery notes yourself. See [Manually reconcile invoices](https://support.haddock.app/en/article/manually-reconcile-invoices-segpkg/).

**AI reconciliation** — when enabled, run AI analysis on pending invoices. See [Reconcile your documents now with AI](https://support.haddock.app/en/article/reconcile-your-documents-now-with-ai-1gzzuy/).

### Can I undo a reconciliation?

Yes. See [Undo reconciliation](https://support.haddock.app/en/article/undo-reconciliation-1w0640p/).

### Why do documents not appear in reconciliation?

Check the **supplier**:

- The supplier should be set up for delivery notes.
- In the supplier profile, choose whether invoices **always** appear for reconciliation, **only when they have delivery notes**, or **never**.

Documents must be **processed** and not already reconciled. See [Supplier invoice reconciliation settings](https://support.haddock.app/en/article/supplier-invoice-reconciliation-settings-12ii5f1/).