---
title: "Append a prospective functional-currency transition"
method: POST
path: "/companies/{companyId}/entities/{entityId}/functional-currency-transitions"
tags: ["Company Settings"]
---

# Append a prospective functional-currency transition

`POST /companies/{companyId}/entities/{entityId}/functional-currency-transitions`

## Request

- Base URL: `https://api.medianfi.com/api/v1`
- URL: `https://api.medianfi.com/api/v1/companies/{companyId}/entities/{entityId}/functional-currency-transitions`
- Auth: HTTP bearer

Admin/owner only. Appends immutable authority after the latest effective transition and after the entity's latest posted journal date.

## Request body

- ChangeFunctionalCurrencyInput
  - `currency` string, required
  - `effectiveFrom` string, date, required
  - `reason` string, required

## Response `201`

Functional-currency transition appended

- FunctionalCurrencyTransitionResponse
  - `success` boolean
  - `data` FunctionalCurrencyHistoryRecord
    - `id` string, uuid, required
    - `companyId` string, uuid, required
    - `entityId` string, uuid, required
    - `currencyCode` string, required
    - `effectiveFrom` string, date, required
    - `reason` string, required
    - `createdByUserId` string, uuid, nullable, required
    - `createdAt` string, date-time, required

## Other responses

- `401`: Authentication required
- `403`: Insufficient permissions or not a company member
- `404`: Resource not found
- `409`: Transition conflicts with immutable currency or posted-journal history
- `422`: Request failed validation

---

[API](https://skmtc.dev/medianfi/apis/median-api.md) · [All operations](https://skmtc.dev/medianfi/apis/median-api/llms.txt) · [OpenAPI document](https://skmtc.dev/medianfi/apis/median-api/revisions/20090ea32b0d?raw)