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EDIFACT message guide · Projects and construction

CONWQD Work item quantity determination

The UN/EDIFACT message used to justify the work item quantities given in messages that describe work items or their progress.

Sent by
Contractor or other construction partner
Received by
Client's representative or other partner
Standard
UN/EDIFACT · Batch message
X12 equivalent
No direct equivalent

What is the EDIFACT CONWQD message?

CONWQD is the UN/EDIFACT work item quantity determination message. The directory describes it as typically used between a contractor and the client's representative or other partners to justify the work item quantities given in messages that describe the work items or their progress.

Quantity determination carries the measurements and calculations behind a quantity, such as dimensions taken from drawings or site surveys. It lets the client's representative check how a reported quantity was derived without paper calculation sheets. It reduces disputes over measured quantities.

How the EDIFACT CONWQD message worksDiagram of the UN/EDIFACT CONWQD Work item quantity determination message. Contractor or other construction partner sends it to client's representative or other partner. It usually starts the exchange. It is usually followed by CONQVA. Inside the UNB and UNH envelopes, the directory D.21A requires, in the start of message: BGM (Beginning of message) and body and segment groups: the required SG6 loop with BII (Structure identification). 4 conditional segment groups are listed by their trigger segment.How the EDIFACT CONWQD message worksWork item quantity determination: who sends it, where it fits and what the directory marks mandatory1 WHERE IT FITSUSUALLY FOLLOWSStarts the exchangeCONWQDSENDERContractor or otherconstruction partnerRECEIVERClient's representativeor other partnerCONTRL syntax report back, if agreedUSUALLY FOLLOWED BYCONQVAQuantity valuation2 WHAT DIRECTORY D.21A REQUIRESInterchange: sender and recipient IDsUNB … UNZMessage CONWQDUNH … UNTSTART OF MESSAGEBGMBeginning of messageBODY AND SEGMENT GROUPSMandatory group SG6 · repeats up to 9,999BIIStructure identification+ 4 conditional groups, starting with:RFFNADLINBlue box: mandatory segment group. Conditional groups are listed by the trigger segment that starts them; a group is sent only when its data applies.Conditional segments outside groups are not drawn.Structure: mandatory segments and groups in the UN/EDIFACT directory D.21A listing for CONWQD. Your trading partner's implementation guide adds itsown requirements.
How the EDIFACT CONWQD message worksDiagram of the UN/EDIFACT CONWQD Work item quantity determination message. Contractor or other construction partner sends it to client's representative or other partner. It usually starts the exchange. It is usually followed by CONQVA. Inside the UNB and UNH envelopes, the directory D.21A requires, in the start of message: BGM (Beginning of message) and body and segment groups: the required SG6 loop with BII (Structure identification). 4 conditional segment groups are listed by their trigger segment.How the EDIFACT CONWQDmessage worksWork item quantity determination: who sends it,where it fits and what the directory marksmandatory1 WHERE IT FITSUSUALLY FOLLOWSStarts the exchangeCONWQDSENDERContractor orotherconstructionpartnerRECEIVERClient'srepresentativeor other partnerCONTRL syntax report back, if agreedUSUALLY FOLLOWED BYCONQVAQuantity valuation2 WHAT DIRECTORY D.21A REQUIRESInterchange: sender and recipient IDs(UNB … UNZ)Message CONWQD (UNH … UNT)START OF MESSAGEBGMBeginning of messageBODY AND SEGMENT GROUPSMandatory group SG6 · repeats upto 9,999BIIStructure identification+ 4 conditional groups, starting with:RFFNADLINBlue box: mandatory segment group. Conditionalgroups are listed by the trigger segment thatstarts them; a group is sent only when its dataapplies. Conditional segments outside groups arenot drawn.Structure: mandatory segments and groups in theUN/EDIFACT directory D.21A listing for CONWQD.Your trading partner's implementation guide adds itsown requirements.

How to read this diagram: the top row shows who sends CONWQD, to whom, and which messages usually come before and after it. The lower part shows what the directory D.21A itself requires: the envelopes around CONWQD and the segments and segment groups it marks mandatory. Conditional groups are listed by their trigger segment rather than drawn in full. This is the directory's minimum, not a trading partner's requirement: a message implementation guide, such as an industry subset or a partner’s own guide, usually makes some conditional groups mandatory, restricts the codes and may use an older directory.

Expand diagram Download SVG

When it is used

  • Justifying quantities in progress reports
  • Exchanging measurement calculations
  • Resolving disputed quantities

Where it fits in the message flow

This message CONWQD Work item quantity determination
Usually followed by CONQVA Quantity valuation

Structure

Mandatory segments in CONWQD (directory D.21A)

In UN/EDIFACT directory D.21A, the CONWQD message has 29 segment positions arranged in 9 segment groups. These are the segments and segment groups marked mandatory at message level, in order; a mandatory group is shown with the segment that starts it. Segments inside conditional groups are needed only when the group is used. This is the directory’s requirement, not your trading partner’s: each partner’s message implementation guide names the directory it uses, often an older one such as D.96A or D.01B where the structure can differ, makes some conditional segments mandatory and restricts the codes.

  • UNH
  • BGM
  • SG6 (BII)
  • UNT

Practical example

CONWQD in practice

A contractor reports 3,400 square meters of paving completed. The client's surveyor questions the figure, and the contractor sends a CONWQD with the measured areas of each section and the calculation. The surveyor checks the measurements against the drawings and accepts the quantity.

Implementation

Implementation considerations for CONWQD

  • Link measurements to the work items they support.
  • Use measurement rules agreed in the contract.
  • Keep calculations reproducible from the data sent.
  • Store determinations with the valuations they support.

How ECOM helps

Automate CONWQD with ECOM

Industry

Industrial Manufacturing

Distributor, OEM customer and supplier integration for industrial manufacturers.

Solution

B2B Integration

Connect every customer, supplier, carrier and bank across EDI, API, file and portal channels.

Solution

Financial Document Automation

Automate invoices, remittances, payment files and bank statements from capture to posting.

Compare X12 and EDIFACT, or see answers to general questions in the EDI FAQ.

Related messages

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