Odoo's accounting module isn't Fortnox. It's more complex, more powerful, and requires more initial configuration. But it does things Fortnox can't: automatic invoicing from sales orders, VAT per product, and integration with everything else in the system.
Chart of accounts
Odoo ships with a Swedish chart of accounts (BAS chart) that you activate during database installation. Select country Sweden, and the right accounts, tax types, and report templates are set. It can be customized later, but the base setup covers most needs.
Invoices
Created automatically from sales orders or manually. Each invoice is booked automatically: debit on accounts receivable, credit on revenue account, VAT on tax account. PDF is generated and can be sent via email directly from the system.
Vendor invoices
Scan and upload PDFs. Odoo CE has basic OCR (Enterprise has more advanced). Match against purchase orders. Approve and post. Payment is registered manually or via bank reconciliation.
Bank reconciliation
Import bank transactions (CSV or OFX). Odoo suggests matches against open invoices. You approve with one click. Unmatched transactions are booked manually. It doesn't replace an accountant, but it reduces manual work significantly.
VAT report
Generated automatically based on posted transactions. Filter by period. Export as documentation for the tax authority. Verify that tax codes are correctly configured, otherwise the report will be wrong.
The accounting module requires you to understand basic bookkeeping. It doesn't do it for you, it automates what you already know. Have an accountant available during setup.