I'm trying to create a pipeline containing a view from a federated source. In this case, I'd like to just create materialized views from the federation and and schedule the pipeline for execution. If I define a pipeline  with only something like the following:

I get the following error:

com.databricks.pipelines.execution.core.ExecutionFailedException: [DLT ERROR CODE: NO_TABLES_IN_PIPELINE] No tables are defined by the libraries of this pipeline. This error usually occurs when flows defined without defining the table they target, or when all top-level definitions are views.

Is it not possible to create a pipeline with just views or is there some other  way I should be doing this?