Blocking findingX12_ST_SE_CONTROL_MISMATCHx12 base

ST02 and SE02 control numbers do not match

The transaction header and trailer identify different control values.

Fix

Make the source change, then revalidate

Use the same generated transaction control number in ST02 and SE02. Keep it distinct from interchange and group controls.

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.