Blocking findingX12_SE_SEGMENT_COUNTx12 base

X12 SE01 segment count mismatch

SE01 must equal the number of segments from ST through SE, inclusive.

Fix

Make the source change, then revalidate

Regenerate the transaction trailer after the final transaction segment is known. Do not hand-maintain SE01.

What to inspect

Open the exact location reported by the validator. Confirm the source mapping or warehouse value rather than editing the outbound document as a one-off.

How to prevent recurrence

Add the rejected file as a sanitized regression fixture. Keep the expected finding code stable so mapping changes cannot silently reintroduce it.

Run this rule against your payload

Reviewed 2026-07-16 · Rule pack 2026.07.16 · Current account documentation remains controlling.