# require_register_account_next_operation · FT4 Rell API · Chromia Docs (concept)

> function require_ register_ account_ next_ operation() Verifies that the next operation in the transaction is an operation that can be used to
register acc

Source: https://docs.chromia.com/pages/ft4-rell/-f-t4-library/lib.ft4.core.accounts.strategies/require_register_account_next_operation/

FUNCTION

# require\_register\_account\_next\_operation

```signature
function require_register_account_next_operation()
```

[Source](https://gitlab.com/chromaway/ft4-lib/-/blob/development/rell/src/lib/ft4/core/accounts/strategies/module.rell#lines-375)

Verifies that the next operation in the transaction is an operation that can be used to
register accounts. Any operation that is whitelisted to be called after `evm_signatures` is
considered valid here.

Throws `"MISSING REGISTER ACCOUNT"` if:

* the next operation is not whitelisted
* this is the last operation in the transaction

Throws if the `chromia.yml` cannot be parsed for `evm_signatures_authorized_operations`,
e.g. if some elements are not text or there are duplicates.

**See Also**

* `core.auth.auth.is_evm_signatures_authorized_operation` — for information on what operations are authorized.

[View this page on docs.chromia.com](https://docs.chromia.com/pages/ft4-rell/-f-t4%20-library/lib.ft4.core.accounts.strategies/require_register_account_next_operation.html)Generated API reference, mirrored from the live docs