def METHOD_NAME(source_path: Path, project_path: Path) -> None:
    """Validate the source path exists and is relative to the project path.
    Args:
        source_path: Absolute source path.
        project_path: Path to the Kedro project.
    Raises:
        ValueError: If source_path is not relative to project_path.
        NotADirectoryError: If source_path does not exist.
    """
    try:
        source_path.relative_to(project_path)
    except ValueError as exc:
        raise ValueError(
            f"Source path '{source_path}' has to be relative to "
            f"your project root '{project_path}'."
        ) from exc
    if not source_path.exists():
        raise NotADirectoryError(f"Source path '{source_path}' cannot be found.")