{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "$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"
}