Production Plan - Default BOM for Service Item in selected SO

I am trying to create a production plan from SOs. After selecting the required SO and clicking ‘Get Finished Goods for Manufacture’, the following error is displayed -

Default BOM is set for to be manufactured items and the SOs contain some service items as well. As per ERPNext documentation, all item with default BOM set are included in the production plan. So I assume that service items or items not having default BOM should be skipped.