Kontenrahmen
A Kontenrahmen is a standardised chart of accounts that assigns a number to every ledger account a business can post to.
The Kontenrahmen is the shared vocabulary of German bookkeeping. Because everyone uses the same standard frameworks (SKR03, SKR04 and industry variants), a tax advisor can read any client's books without a legend.
From an accounts-payable view, the chart is the target: every invoice line has to be mapped onto exactly one account before it can be booked. Consistent mapping is what keeps month-end fast and audits calm.
Cortena works with the chart your firm already uses, so coded lines match your existing ledger structure.