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When Fortnox corrects a voucher, the SIE file contains #BTRANS (added) and #RTRANS (removed) lines alongside #TRANS (final state). The parser was summing all three, causing corrected vouchers to appear unbalanced. Only #TRANS represents the final voucher state — BTRANS/RTRANS are correction audit trail. Co-authored-by: Claude Opus 4.6 (1M context) <noreply@anthropic.com>