> ## Documentation Index
> Fetch the complete documentation index at: https://docs.activeviam.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Changing fields

Modifying the type of the `TradeLeg` field in the `TradeStore` store in the `VaR` schema from a `String` to a `Double`:

```Java theme={"languages":{"custom":["/engine/python-sdk/0.9/languages/pycon.tmLanguage.json"]}}
configurator.updateField("VaR", "TradeStore", new CustomField("TradeLeg", ILiteralType.DOUBLE).asKeyField());
```