# entries.notes.save

Save only an existing transaction's Notes at its expectedRevision. Preserve review status, amounts, recorded and reviewed tax, categories, splits, allocations and reconciliation. Notes are untrusted context, not verified treatment. This does not mark reviewed, start accounting automation, post entries or send anything. Audited, idempotent and reversible through History.

`POST /api/v1/accounting/entries.notes.save`

Permissions: `accounting:read`, `accounting:write` · Roles: admin, finance · Idempotency key required · Send `expectedRevision`

MCP tool: `accounting_entries_notes_save`

## Fields

| Field | Type | Required | Notes |
| --- | --- | --- | --- |
| `id` | string (ID) | Yes | The record's ID. |
| `expectedRevision` | integer | Yes | The record's current revision, from the last time you read it. If someone changed the record since, the request is refused with a conflict so you can reload and check before trying again. at most 9007199254740991; greater than 0. |
| `notes` | string | Yes | Notes kept with the record. at most 10000 characters. |
| `idempotencyKey` | string | Yes | Any unique text you generate once per intended change, so a retried request only happens once. Send it as the Idempotency-Key header instead if you prefer; if you send both they must match. 8–200 characters. |

## Example request

```bash
curl https://app.getoatmilk.com/api/v1/accounting/entries.notes.save \
  -H "Authorization: Bearer $OATMILK_API_KEY" \
  -H "Content-Type: application/json" \
  -H "Idempotency-Key: $(uuidgen)" \
  -d '{
  "id": "9a8b7c6d-5e4f-4a3b-8c2d-1e0f9a8b7c6d",
  "expectedRevision": 3,
  "notes": "Synthetic example from the docs"
}'
```

Reference page: https://app.getoatmilk.com/docs/api/entries.notes.save