# Correction

## Overview

There are two ways of fixing mistakes around wrong scores, whether the latest point scored (Undo) should be fixed, or a previously assigned score (Correction) should be amended. These two messages are different, but structurally similar packets.

1. Undo
2. Correction (Score Edit)

## 1. Undo

The last [scored point](https://app.gitbook.com/@img-arena/s/table-tennis/~/drafts/-MfCuNZN8vla5OkSK5HV/live-data-scenarios/the-basics#point-scored) can be undone due to a point decrement or a penalty point decrement action. Semantically, an `Undo` packet means the official chose to revert the most recently emitted packet(s). Under the `scores` field a snapshot should be found of what is understood to be the latest scores of the match after taking into account the effect of the undo. Also included is a field named `undoneEventSeqNums` which details which packets were removed. In case of an Undo packet, it's always seqNum - 1.

```
{
    "eventElementType": "Undo",
    "id": 0,
    "seqNum": 27,
    "matchScore": {
        "pointsA": 0,
        "pointsB": 0
    },
    "scores": [
        {
            "pointsA": 0,
            "pointsB": 11
        },
        {
            "pointsA": 5,
            "pointsB": 4
        },
        {
            "pointsA": 0,
            "pointsB": 0
        },
        {
            "pointsA": 0,
            "pointsB": 0
        },
        {
            "pointsA": 0,
            "pointsB": 0
        }
    ],
    "game": 2,
    "timestamp": "1970-01-01T00:00:00.000Z",
     "undoneEventSeqNums": [
    26
    ]
}

```

## 1. Correction (Score Edit)

A `Correction` packet means the official modified packets that occurred at some point in the past. Like `Undo` packets, under the `scores` field a snapshot of what is understood to be the current state of the match after taking into account the effect of the correction(s).

```
{
    "eventElementType": "Correction",
    "id": 0,
    "seqNum": 27,
    "scores": [
        {
            "pointsA": 0,
            "pointsB": 11
        },
        {
            "pointsA": 5,
            "pointsB": 4
        },
        {
            "pointsA": 0,
            "pointsB": 0
        },
        {
            "pointsA": 0,
            "pointsB": 0
        },
        {
            "pointsA": 0,
            "pointsB": 0
        }
    ],
    "matchScore": {
        "pointsA": 0,
        "pointsB": 0
    },
    "game": 2,
    "timestamp": "1970-01-01T00:00:00.000Z",
}

```


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