TBG6 Architecture, Engineering and Construction
This specification provides the definition of the Work item quantity determination message (CONWQD) to be used in Electronic Data Interchange (EDI) between trading partners involved in administration, commerce and transport.
There are occasions during the construction process when it is required to substantiate the quantities associated with specific sections of work. This message will be needed by various parties involved in the project to determine these quantity details.
1.1 Functional definition
Typically this message will be used between a contractor and the client's representative or other partners within the construction process, for justifying the work item quantities given in messages that describe the work items or their progress valuations.
1.2 Field of application
The Work item quantity determination message may be used for both national and international applications. It is based on universal practice related to administration, commerce and transport, and is not dependent on the type of business or industry.
There are several examples within the construction process where one party is required to justify to another party the quantities per work item he has already given in earlier messages.
A project may be subdivided into individual groupings of work, referred to as items and it is against the quantities of these items that a justification has to be given.
Within the Construction industry there are numerous rules which govern this part of the process. Although efforts have been made to keep the design of the message generic, other potential users of this message are cautioned about the specific and original role for which it has been designed.
This is only one of a number of messages being designed for the construction industry. This particular message refers to already described items of work or their progress valuation in earlier sent construction messages.
This message is for verifiable and provable quantities per work item which include individual calculations with sub- and intermediate totals. The message contains the quantities and how they are assessed for each of the work items. For every work item the quantity per unit must be determined (except those with a flat rate, which are paid according to payment schedules). The unit of quantity is defined by common technical rules. Rules describe the way in which quantities are calculated. These use standard formulae.
See UNTDID, Part 4, Chapter 2.3 UN/ECE UNSM - General Introduction, Section 1.
3. TERMS AND DEFINITIONS
3.1 Standard terms and definitions
See UNTDID, Part 4, Chapter 2.3 UN/ECE UNSM - General Introduction, Section 2.
4. MESSAGE DEFINITION
4.1 Data segment clarification
This section should be read in conjunction with the segment table which indicates mandatory, conditional and repeating requirements.