TBG6 Architecture, Engineering and Construction
This specification provides the definition of the Quantity valuation message (CONQVA) to be used in Electronic Data Interchange (EDI) between trading partners involved in administration, commerce and transport.
1.1 Functional definition
Typically, this message will be used for a contractor to submit progress details to a client or his representative. The message will be used also for subsets of the project where work has been contracted out to other parties. In these cases the exchange would be between the subcontractor and the party that subcontracted the work.
1.2 Field of application
The Quantity valuation 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.
The following descriptions refer to the construction industry as an example, but do not exclude other business sectors' implementation.
This message is to be used to support the business of exchanging progress information for groups of work items which make up a construction project.
There are several examples within the construction process where one party is required to advise another party about the quantity of work performed for a specific time period or since the start of the project.
A project may be subdivided into individual groupings of work referred to as items and it is against these items that progress quantities are reported.
During the design of this message every effort has been made to adopt a "generic" approach and it seems possible that other industries may find this a suitable message to adopt.
This is only one of a number of messages being designed for the Construction industry. This particular message refers to already established items of work, these items will be defined at the start of a project. Work is well advanced on suitable EDI messages to address this part of the process.
Allowance has been made within the CONQVA message for "new" items of work. There are a number of reasons why additional items of work will occur once a project has started.
Each work item may contain more than one quantity and this has been accommodated. An example of this would be the quoting of both a cumulative and a "this period" quantity.
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.