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What is an EDI 943?

The EDI 943 tells a warehouse that inventory is on its way to them: the advance notice of a stock transfer shipment arriving into the warehouse, not an order leaving it.

Seller → 3PL warehouse
Written by EDI specialists
Everything is on the page, nothing to fill in

Last reviewed October 6, 2026 by Effective Data's EDI specialists.

Where it fits

When the 943 is used, and which way it travels

How the EDI 943 travelsThe 943 Warehouse Stock Transfer Shipment Advice goes from Seller to 3PL warehouse. In sequence with: 940, 945, 943, 944, 947.Seller3PL warehouse943Warehouse Stock Transfer Shipment AdviceIn sequence940Warehouse order945Warehouse advice943Transfer shipment944Transfer receipt947Inventory…
How the EDI 943 travelsThe 943 Warehouse Stock Transfer Shipment Advice goes from Seller to 3PL warehouse. In sequence with: 940, 945, 943, 944, 947.Seller3PL warehouse943Warehouse Stock Transfer Shipment AdviceIn sequence940Warehouse order945Warehouse advice943Transfer shipment944Transfer receipt947Inventory adjustment
Which way the 943 travels, and the documents it is usually traded alongside. Partner implementation guides can add or drop documents from this set.

When a manufacturer or seller moves stock INTO a 3PL warehouse, the 943 travels ahead of the freight so the warehouse can plan receiving: what is coming, how it is identified, and when it arrives. It is the inbound mirror of the 940, which instructs shipments OUT.

Effective Data groups the 943 with the 940, 944 and 947 as the warehouse and inventory documents covering item shipments, stock transfers, receipts and inventory updates.

Also called the Stock Transfer Shipment. Same document, same number.

Inside the document

The segments, and what each one carries

The published X12 structure, minus the segments most partners never use. Each partner's implementation guide narrows this further: which qualifiers, which identifiers, how many decimals. That guide, not the standard, is what your file is validated against.

Structure of the EDI 943An ISA/IEA interchange envelope wraps a GS/GE functional group, which wraps the 943 transaction set from ST to SE. Header: W06, N1, G62. Detail: W04. Summary: W03.ISAInterchange envelopeIEAGSFunctional groupGESTTransaction set 943SEHeaderW06N1G62Detailrepeats per line or loopW04SummaryW03
Structure of the EDI 943An ISA/IEA interchange envelope wraps a GS/GE functional group, which wraps the 943 transaction set from ST to SE. Header: W06, N1, G62. Detail: W04. Summary: W03.ISAInterchange envelopeIEAGSFunctional groupGESTTransaction set 943SEHeaderW06N1G62Detailrepeats per line or loopW04SummaryW03
The 943 inside its X12 envelope. ISA and GS wrap every interchange; ST and SE open and close this document; the segments between them are the ones listed below, in the part of the document they belong to.
SegmentNamePartWhat it carries
ST Transaction Set Header Header Identifies the document as a 943 and opens the control number the trailer must match.
W06 Warehouse Shipment Identification Header The transfer shipment number and its date: what the warehouse should expect on the dock.
N1 Party Identification Header Who is shipping the stock and which warehouse receives it.
G62 Date/Time Header Ship date and expected arrival.
W04 Item Detail Total Detail The items in the transfer: identifiers, quantities and units of measure the warehouse will verify at receipt.
W03 Total Shipment Information Summary Total units, weight and volume, as the integrity check on the lines.
SE Transaction Set Trailer Summary Closes the set. Segment count and control number must match the ST.
ST Transaction Set Header Header
Identifies the document as a 943 and opens the control number the trailer must match.
W06 Warehouse Shipment Identification Header
The transfer shipment number and its date: what the warehouse should expect on the dock.
N1 Party Identification Header
Who is shipping the stock and which warehouse receives it.
G62 Date/Time Header
Ship date and expected arrival.
W04 Item Detail Total Detail
The items in the transfer: identifiers, quantities and units of measure the warehouse will verify at receipt.
W03 Total Shipment Information Summary
Total units, weight and volume, as the integrity check on the lines.
SE Transaction Set Trailer Summary
Closes the set. Segment count and control number must match the ST.
The part that costs money

Why yours is being rejected

Every EDI provider publishes what an 943 is. What matters in production is why one fails, and these are the failure modes we can put a source against today:

  1. Item identifiers the warehouse does not know. A 943 line whose UPC or item number is not in the warehouse’s item master cannot be received against, and the freight sits on the dock while someone reconciles catalogs.

If one of these is happening to you right now, skip to the bottom of the page and describe it. Diagnosing rejected documents is most of what we do.

Related documents

The documents the 943 travels with

944

Warehouse Stock Transfer Receipt Advice

Read it →
940

Warehouse Shipping Order

Read it →
945

Warehouse Shipping Advice

Read it →
947

Warehouse Inventory Adjustment Advice

Read it →

Frequently asked

+ What is an EDI 943?

The Warehouse Stock Transfer Shipment Advice: notice to a warehouse that a stock transfer is inbound to them, with the items, quantities and dates they should receive against.

+ How does the 943 differ from the 940?

Direction. The 940 instructs the warehouse to ship goods OUT to a buyer; the 943 warns the warehouse that stock is coming IN. A 3PL relationship usually trades both.

+ What answers a 943?

The 944 Stock Transfer Receipt Advice: the warehouse’s report of what actually arrived, reconciled against what the 943 said was shipped.

Is your 943 failing, or being mandated by a partner?

Describe the situation and a named EDI specialist will tell you what it takes, including when the answer is that you do not need us.

Or call 847.969.9300

Answered by a named EDI specialist on the same business day. If we are not the right answer we will say so on the first call.