# T306

> record literal has wrong fields

**Severity** Error

A record literal `Name { ... }` must set every field of the type exactly once, with a value of the field's type. The literal here omits a field, names a field that does not exist, repeats one, or passes a value of the wrong type.

Match the declared field list. Fields cannot have defaults, so nullable fields still need an explicit `null`.

## Failing example

```flowscope
script "Print log"
data tape = subscribe(data.trades, minNotional: 500_000.0)
type Print {
  price: float
  usd: float
  buy: bool
}
state last: Print? = null
on tape.trade(tr) {
  let prev = last
  if prev != null && prev.buy != tr.isBuy {
    log.info(str.format("side flip at {0}", tr.price))
  }
  last = Print { price: tr.price, usd: tr.notional }
}
```

## Fixed example

```flowscope
script "Print log"
data tape = subscribe(data.trades, minNotional: 500_000.0)
type Print {
  price: float
  usd: float
  buy: bool
}
state last: Print? = null
on tape.trade(tr) {
  let prev = last
  if prev != null && prev.buy != tr.isBuy {
    log.info(str.format("side flip at {0}", tr.price))
  }
  last = Print { price: tr.price, usd: tr.notional, buy: tr.isBuy }
}
```

## Related

- [T301](/docs/scripting/reference/diagnostics/t301)
- [T307](/docs/scripting/reference/diagnostics/t307)
- [T442](/docs/scripting/reference/diagnostics/t442)