Transition the change order state

Finance module

POST/change-orders/{id}/transitionschangeOrders.transition

Moves the change order lifecycle to another state through its transition RPC, which writes the transition ledger. Uses compare-and-set on `expected_state`; a disallowed transition returns a 422 refusal. Requires `Idempotency-Key`; a replay returns the original response. A rule that refuses the request returns 422 with `refusal` and `reason`.

Requires the capability finance.change_order.write.
OAuth scopes: finance.
Send an Idempotency-Key header. A replay with the same key returns the original response.
Error statuses: 400, 401, 404, 409, 422, 429. Errors are RFC 9457 problem details.

Path and query parameters

changeOrders.transition: Path and query parameters
Field	Type	Required	Description
id	string (uuid)	Yes	Identifier of the change order.

Request body: ChangeOrderTransitionRequest

changeOrders.transition: ChangeOrderTransitionRequest
Field	Type	Required	Description
expected_state	"Proposed" \| "Priced" \| "Approved" \| "Rejected" \| "Canceled"	Yes	The state the caller believes the row is in (compare-and-set).
to_state	"Proposed" \| "Priced" \| "Approved" \| "Rejected" \| "Canceled"	Yes	Target state.
reason	string	No	Reason, required by some transitions.Constraints: length 1 to any

{
  "expected_state": "Proposed",
  "to_state": "Canceled",
  "reason": "Client approved the revised scope."
}

Response 200: ChangeOrder

changeOrders.transition: ChangeOrder
Field	Type	Required	Description
id	string (uuid)	Yes	Identifier of the change order.
org_id	string (uuid)	Yes	Identifier of the owning organization, derived from the parent row and never accepted from the caller.
created_at	string (date-time)	Yes	When the row was created.
created_by	string (uuid) \| null	Yes	Identifier of the person who created the row; null when a seed, platform or system process created it.
updated_at	string (date-time)	Yes	When the row was last updated.
updated_by	string (uuid) \| null	Yes	Identifier of the person who last updated the row; null when a seed, platform or system process updated it.
project_id	string (uuid)	Yes	Identifier of the project.
title	string	Yes	Change order title.Constraints: length 1 to 300
reason	string \| null	Yes	What changes and why.Constraints: length 1 to 20000
requested_by	string (uuid) \| null	Yes	Identifier of the requester.
change_order_state	"Proposed" \| "Priced" \| "Approved" \| "Rejected" \| "Canceled"	Yes	Change order state.
total	MoneyTotal	Yes	A money aggregate that never coerces unpriced inputs to zero.
budget_id	string (uuid)	Yes	Identifier of the budget the change order revises.
change_order_number	integer	Yes	Change order number within the project.Constraints: range 1 to any
order_type_enum_id	string \| null	Yes	Canon change order type.Constraints: pattern ^[A-Za-z0-9][A-Za-z0-9._-]{0,63}$
priced_by	string (uuid) \| null	Yes	Identifier of the person who priced the change order.
schedule_impact_days	integer \| null	Yes	Days the change moves the schedule; negative when it pulls it in, zero for none.Constraints: range -3650 to any
client_impact	string \| null	Yes	Effect of the change on the client, as stated.Constraints: length 1 to 500
approved_at	string (date-time) \| null	Yes	When the change order moved to Approved, from its transition ledger.
approved_by	string (uuid) \| null	Yes	Identifier of the person who moved the change order to Approved.

{
  "id": "0192f1e2-7c3a-7b4d-9e8f-1a2b3c4d5e6f",
  "org_id": "0192f1e2-7c3a-7b4d-9e8f-1a2b3c4d5e6f",
  "created_at": "2026-10-08T14:30:00Z",
  "created_by": "0192f1e2-7c3a-7b4d-9e8f-1a2b3c4d5e6f",
  "updated_at": "2026-10-08T14:30:00Z",
  "updated_by": "0192f1e2-7c3a-7b4d-9e8f-1a2b3c4d5e6f",
  "project_id": "0192f1e2-7c3a-7b4d-9e8f-1a2b3c4d5e6f",
  "title": "Add Second Bar",
  "reason": "Client added a second bar at the north lawn.",
  "requested_by": "0192f1e2-7c3a-7b4d-9e8f-1a2b3c4d5e6f",
  "change_order_state": "Proposed",
  "total": {
    "total_minor": 1250000,
    "currency": "USD",
    "unpriced_count": 2
  },
  "budget_id": "0192f1e2-7c3a-7b4d-9e8f-1a2b3c4d5e6f",
  "change_order_number": 3,
  "order_type_enum_id": "ENM-092",
  "priced_by": "0192f1e2-7c3a-7b4d-9e8f-1a2b3c4d5e6f",
  "schedule_impact_days": 2,
  "client_impact": "Adds a second stage to the run of show.",
  "approved_at": "2026-10-08T14:30:00Z",
  "approved_by": "0192f1e2-7c3a-7b4d-9e8f-1a2b3c4d5e6f"
}

Code samples

curl -X POST "$XOS_BASE_URL/change-orders/0192f1e2-7c3a-7b4d-9e8f-1a2b3c4d5e6f/transitions" \
  -H "Authorization: Bearer $XOS_API_KEY" \
  -H "Idempotency-Key: $(uuidgen)" \
  -H "Content-Type: application/json" \
  -d '{"expected_state":"Proposed","to_state":"Canceled","reason":"Client approved the revised scope."}'

const { data } = await xos.changeOrders.transition("0192f1e2-7c3a-7b4d-9e8f-1a2b3c4d5e6f", {
    "expected_state": "Proposed",
    "to_state": "Canceled",
    "reason": "Client approved the revised scope."
  });

response = xos.change_orders.transition("0192f1e2-7c3a-7b4d-9e8f-1a2b3c4d5e6f", {"expected_state": "Proposed", "to_state": "Canceled", "reason": "Client approved the revised scope."})

xos change-orders transition 0192f1e2-7c3a-7b4d-9e8f-1a2b3c4d5e6f --data '{"expected_state":"Proposed","to_state":"Canceled","reason":"Client approved the revised scope."}'