# Update Relational Dataset Field Schema

`UpdateRelationalDatasetFieldSchema`

`POST /api/relationaldatasetdefinitions/{scope}/{code}/fieldschema/$update`

- [OpenAPI fragment](https://www.lusid.com/docs/api/lusid/endpoints/relational-dataset-definition/UpdateRelationalDatasetFieldSchema.json)
- [Rendered page](https://www.lusid.com/docs/api/lusid/endpoints/relational-dataset-definition/UpdateRelationalDatasetFieldSchema)

Update an existing relational dataset definition with the new field schema.
Applicable only to the definitions that are already in use i.e. contain DataPoints associated with this definition.

## Referenced schemas

- [UpdateRelationalDatasetFieldSchema](https://www.lusid.com/docs/api/lusid/schemas/UpdateRelationalDatasetFieldSchema.txt)
- [RelationalDatasetDefinition](https://www.lusid.com/docs/api/lusid/schemas/RelationalDatasetDefinition.txt)

[< Relational Dataset Definition](https://www.lusid.com/docs/api/lusid/endpoints/relational-dataset-definition/llms.txt)