No entitity configure for the data source of this data view means that that you did not select an entity that you pass as parameter on that page. If you double click on the page it will bring you to the page with the error. A dataview on a page always needs an entity that to be able to show the data of that object.
And offline profiles means that you can only use the data on the device. Microflows always need to have an internet connection because it needs the server. Nanoflow can be used in offline mode. You might want to follow this learning path: https://academy.mendix.com/link/paths/66/Build-a-Native-Mobile-Inspection-App
Your application is uses an offline profile, so read up on this page, if you have not done so already: https://docs.mendix.com/refguide/offline-first. Especially about deleting an object:
So upgrading to 9.7 will give you an improved platform and considering this documentation one may expect the ‘delete’-errors to vanish.