# MPTokenIssuanceSet

[[Source]](https://github.com/XRPLF/rippled/blob/master/src/xrpld/app/tx/detail/MPTokenIssuanceSet.cpp)

Update a mutable property of a [Multi-purpose Token (MPT)](/docs/concepts/tokens/fungible-tokens/multi-purpose-tokens) issuance, including locking (freezing) or unlocking the tokens globally or for an individual holder.

MPTokensV1
## Example MPTokenIssuanceSet JSON

This example locks the balances of all holders of the specified MPT issuance.


```json
{
    "TransactionType": "MPTokenIssuanceSet",
    "Account": "rNFta7UKwcoiCpxEYbhH2v92numE3cceB6",
    "MPTokenIssuanceID": "05EECEBE97A7D635DE2393068691A015FED5A89AD203F5AA",
    "Fee": "10",
    "Flags": 1,
    "Sequence": 99536577
}
```

##  Fields

In addition to the [common fields](/docs/references/protocol/transactions/common-fields),  transactions use the following fields:

| Field | JSON Type | [Internal Type](/docs/references/protocol/binary-format) | Required? | Description |
|  --- | --- | --- | --- | --- |
| `MPTokenIssuanceID` | String - Hexadecimal | UInt192 | Yes | The identifier of the `MPTokenIssuance` to update. |
| `Holder` | String - [Address](/docs/references/protocol/data-types/basic-data-types#addresses) | AccountID | No | An individual token holder. If provided, apply changes to the given holder's balance of the given MPT issuance. If omitted, apply to all accounts holding the given MPT issuance. |


### MPTokenIssuanceSet Flags

Transactions of the `MPTokenIssuanceSet` type support additional values in the `Flags` field, as follows:

| Flag Name | Hex Value | Decimal Value | Description |
|  --- | --- | --- | --- |
| `tfMPTLock` | `0x00000001` | 1 | Enable to lock balances of this MPT issuance. |
| `tfMPTUnlock` | `0x00000002` | 2 | Enable to unlock balances of this MPT issuance. |


## See Also

- [MPTokenIssuance entry](/docs/references/protocol/ledger-data/ledger-entry-types/mptokenissuance)