Scheduled refresh for composite model

Hello, 

Is it possible to do a scheduled refresh on a composite model?

I'm using DirectQuery on a Power BI dataset and the model is also using a Synapse data source and Excel files using Import Mode.

I get the following error when I'm trying to schedule a refresh:

You can't schedule refresh for this dataset because the following data sources currently don't support refresh:

However there are no data sources listed below the error...