Write down your answer
One page. Keep it where your next auditor and your successor can find it.
In scope (besonders wichtig / wichtig), or out of scope
Which Anlage and entry you matched, or the ones you ruled out
Headcount, turnover, balance sheet total, which two financial years, partner and linked companies included
When it was run and by whom
Commercial register entry, the two sets of annual accounts
Anything ambiguous, and why you decided the way you did