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Spotlight PEPPOL BIS Billing 3.0 The EU e-invoicing mandate is here — France Sept 2026, Belgium Jan 2026, Germany 2025.

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X12 841 — Specifications/Technical Information

The 841 transmits or requests technical specifications between industrial partners: engineering change notices (ECN), part descriptions, processes, parametric data, drawing references.

Purpose

The 841 is used to propagate a specification between OEM and supplier on long-cycle products: typically automotive, aerospace, defense. Uses include Engineering Change Notices (ECN), Engineering Change Requests (ECR), PLM part descriptions, process parameters for manufacturing, or drawing revision indices. The body may be structured (explicit parameters) or point to an external attachment via PWK.

The 841 does not move the CAD binary itself: a separate channel handles that (PDM/PLM, SFTP, portal), with the 841 carrying the URL or identifier. It mainly serves as an ordered, auditable notification of a specification update.

Envelope structure

The 841 travels in a functional group SI (Specifications). Didactic example in release 004010 for an ECN:

x12 example-841.x12 
ISA*00*          *00*          *ZZ*ACMEENG       *ZZ*ACMESUPPLIER  *260514*1000*U*00401*000000841*0*P*>~
GS*SI*ACMEENG*ACMESUPPLIER*20260514*1000*1*X*004010~
ST*841*0001~
BSI*00*ECR-2026-0991*20260514*ECN*Engineering Change Notice~
N1*BY*ACME OEM*92*OEM-001~
N1*VN*ACME SUPPLIER INC*92*SUP-009~
LIN*1*PN*PN-WIDGET-A-REV4~
PID*F****PHASE-OUT REV 3; PHASE-IN REV 4~
MSG*Drawing 12-AB ECR rev. 4 — see attached~
PWK*EC*EM*001*AC*www.acme.com/eng/ECR-2026-0991.pdf~
SE*8*0001~
GE*1*1~
IEA*1*000000841~

The BSI (Beginning Segment for Specifications/Technical Information) opens: function code, spec identifier, date, type. The N1 segments name buyer and supplier. The LIN loop identifies the part, PID describes the change, MSG adds structured comments, and PWK points to the attachment (URL or internal ID).

Common segments

  • Header — ST, BSI (Beginning Segment for Specifications/Technical Information), DTM, REF (project no.).
  • Parties — N1 loop (BY, VN, EN = Engineering).
  • Spec / part — LIN loop with PID (description), SPI (Specification Identifier), MEA (parameters), MSG (text).
  • Attachment — PWK (Paperwork) with URL or identifier.
  • Summary — SE.

Common pitfalls

  • Revision index: the part revision must appear in LIN (often as a REV suffix) and in the description; an 841 without an index is ambiguous.
  • Effective date: DTM with qualifier 007 (Effective Date) is mandatory for an ECN; otherwise the supplier cannot tell when to flip production.
  • No binary in EDI: do not try to embed a 5 MB PDF in a BIN: use PWK to point at the PLM portal.

Documentation

The code 841 and the name Specifications/Technical Information are public and listed on x12.org/products/transaction-sets. Industry conventions in automotive (AIAG) and aerospace (RosettaNet adjacent PIPs, Air Transport Association) frame 841 usage.