Demiton · Schema

change_event contract v2

The early warning of a potential change, before it is priced as a variation.

CompanyConstructionCivil EngineeringProject ManagementComplianceMCPArtificial IntelligenceOpen Contracting

Properties

Name	Type	Description
scope	string	whether the change is in or out of the contract scope
title	string	what the potential change is
number	string	the change event number
origin	string	what raised the event, e.g. an RFI or an instruction
status	string	where the event is in its lifecycle
project	string	the project the change event is on
currency	currency	the currency of the impact amounts
raised_at	string	when the event was raised
raised_by	string	who raised the event
change_type	string	the kind of change
cost_impact	number	the estimated effect on cost
description	string	what happened
external_id	string	the source system's own change event id
change_items	array	the event's itemised cost, budget and revenue lines
accepted_days	integer	the programme extension accepted
budget_impact	number	the estimated effect on budget
change_reason	string	why the change arose
prime_contract	string	the head contract the event is estimated against
requested_days	integer	the programme extension sought
revenue_impact	number	the estimated effect on revenue

View JSON Schema on GitHub

JSON Schema

{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "$id": "https://docs.demiton.io/registers/change_event/v2.json",
  "title": "change_event contract v2",
  "type": "object",
  "required": [
    "external_id",
    "project",
    "status",
    "title"
  ],
  "properties": {
    "scope": {
      "type": "string",
      "description": "whether the change is in or out of the contract scope",
      "x-demiton-requiredness": "optional"
    },
    "title": {
      "type": "string",
      "description": "what the potential change is",
      "x-demiton-requiredness": "required"
    },
    "number": {
      "type": "string",
      "description": "the change event number",
      "x-demiton-requiredness": "optional"
    },
    "origin": {
      "type": "string",
      "description": "what raised the event, e.g. an RFI or an instruction",
      "x-demiton-requiredness": "optional"
    },
    "status": {
      "type": "string",
      "description": "where the event is in its lifecycle",
      "x-demiton-requiredness": "required"
    },
    "project": {
      "type": "string",
      "description": "the project the change event is on",
      "x-demiton-requiredness": "required",
      "x-demiton-reference": true
    },
    "currency": {
      "type": "currency",
      "description": "the currency of the impact amounts",
      "x-demiton-requiredness": "optional"
    },
    "raised_at": {
      "type": "string",
      "description": "when the event was raised",
      "x-demiton-requiredness": "optional",
      "format": "date-time",
      "x-demiton-type": "datetime"
    },
    "raised_by": {
      "type": "string",
      "description": "who raised the event",
      "x-demiton-requiredness": "optional",
      "x-demiton-reference": true
    },
    "change_type": {
      "type": "string",
      "description": "the kind of change",
      "x-demiton-requiredness": "optional"
    },
    "cost_impact": {
      "type": "number",
      "description": "the estimated effect on cost",
      "x-demiton-requiredness": "optional",
      "x-demiton-type": "money"
    },
    "description": {
      "type": "string",
      "description": "what happened",
      "x-demiton-requiredness": "optional"
    },
    "external_id": {
      "type": "string",
      "description": "the source system's own change event id",
      "x-demiton-requiredness": "required"
    },
    "change_items": {
      "type": "array",
      "description": "the event's itemised cost, budget and revenue lines",
      "x-demiton-requiredness": "optional"
    },
    "accepted_days": {
      "type": "integer",
      "description": "the programme extension accepted",
      "x-demiton-requiredness": "optional",
      "x-demiton-unit": "days"
    },
    "budget_impact": {
      "type": "number",
      "description": "the estimated effect on budget",
      "x-demiton-requiredness": "optional",
      "x-demiton-type": "money"
    },
    "change_reason": {
      "type": "string",
      "description": "why the change arose",
      "x-demiton-requiredness": "optional"
    },
    "prime_contract": {
      "type": "string",
      "description": "the head contract the event is estimated against",
      "x-demiton-requiredness": "optional",
      "x-demiton-reference": true
    },
    "requested_days": {
      "type": "integer",
      "description": "the programme extension sought",
      "x-demiton-requiredness": "optional",
      "x-demiton-unit": "days"
    },
    "revenue_impact": {
      "type": "number",
      "description": "the estimated effect on revenue",
      "x-demiton-requiredness": "optional",
      "x-demiton-type": "money"
    }
  },
  "x-demiton-register-type": "change_event",
  "x-demiton-contract-version": "2.0.2",
  "x-demiton-store": "tenant",
  "x-demiton-axes": [
    {
      "axis": "project",
      "requirement": "required",
      "role": "subject"
    }
  ],
  "x-demiton-measures": [],
  "x-demiton-provenance": {
    "standards": [
      {
        "code": "AS 2124-1992",
        "title": "General Conditions of Contract (superseded)",
        "access": "paywalled_secondary",
        "region": "Australia",
        "edition": "1992",
        "checked_on": "2026-09-14"
      },
      {
        "code": "AS 4000-1997",
        "title": "General Conditions of Contract (superseded edition, still in use)",
        "access": "paywalled_secondary",
        "region": "Australia",
        "edition": "1997",
        "checked_on": "2026-09-14"
      },
      {
        "code": "AS 4000:2025",
        "title": "General Conditions of Contract (construct only)",
        "access": "paywalled_secondary",
        "clause": "cl 20 (per commentary)",
        "region": "Australia",
        "edition": "2025",
        "checked_on": "2026-09-14"
      },
      {
        "code": "AS 4902-2000",
        "title": "General Conditions of Contract for Design and Construct",
        "access": "paywalled_secondary",
        "region": "Australia",
        "edition": "2000",
        "checked_on": "2026-09-14"
      },
      {
        "code": "Directive 2014/24/EU",
        "title": "Directive 2014/24/EU on public procurement",
        "access": "full_text_verified",
        "clause": "Art. 72",
        "region": "European Union",
        "edition": "consolidated",
        "checked_on": "2026-09-14"
      },
      {
        "code": "Procurement Act 2023",
        "title": "Procurement Act 2023 (c. 54) and Procurement Regulations 2024 (SI 2024/692)",
        "access": "full_text_verified",
        "clause": "ss. 74-75",
        "region": "United Kingdom",
        "edition": "in force 24 Feb 2025",
        "checked_on": "2026-09-14"
      }
    ]
  },
  "description": "The early warning of a potential change, before it is priced as a variation.",
  "x-demiton-contract-url": "https://docs.demiton.io/registers/change_event/",
  "x-demiton-register-catalog": "https://docs.demiton.io/concepts/register-catalog"
}

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