[Yandex DataLens] error Data source modification is not allowed

ERR.DS_API.PREVIEW_SOURCE_MODIFICATION_NOT_ALLOWED

The error means that the user lacks the Read permission for the connection used in the data source when attempting to modify the source via an API request.

For example, in the Public API, when the user has no Read permission for the connection and attempts to modify the source in a dataset preview request.

Use one of the ways below to resolve the error:

• In your request, use the connection previously saved in the dataset.
• If you need to change the source parameters, request access from the connection administrator. For more on access permissions, see Managing access to Yandex DataLens.