Under P6's dedup (one record per bytes) the adapter's constant letter made the example's second write-off of the same invoice reuse the first write-off's record, which a receipt's one-entry rule (B-38) refuses, and the write-off now refuses that before anything is journaled (the S7/P6 integration fix). The example's two write-offs have two notices, which is what it describes. Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01HS8WZziDnyxunC23MUxrLp