Key legal question
Whether the alleged error in the tax assessment was a correctable accounting error under § 76 StG.
Extracted holding
No. The mistake was based on an incorrect factual assumption or assessment, not on a purely mathematical or clerical error, so correction under § 76 StG was unavailable.
Extracted reasoning
A bookkeeping error exists only where a purely arithmetical mistake occurs in a mathematical operation. Incorrect factual assumptions, factual evaluation, or wrong application or interpretation of the law cannot be corrected through the rectification procedure, even if obviously wrong.