def start_import(self, version_id=None):
        """
        Starts importing this draft layerversion (cancelling any running import), even
        if the data object hasn’t changed from the previous version.

        :raises Conflict: if this version is already published.
        """
        if not version_id:
            version_id = self.version.id

        target_url = self._client.get_url('VERSION', 'POST', 'import', {'layer_id': self.id, 'version_id': version_id})
        r = self._client.request('POST', target_url, json={})
        return self._deserialize(r.json(), self._manager)
Starts importing this draft layerversion (cancelling any running import), even
        if the data object hasn’t changed from the previous version.

        :raises Conflict: if this version is already published.