Hi Brains trust. I've been experimenting and was hoping to get confirmation from those in-the-know.
If have a Feature Service in ArcGIS Online which for example uses WGS 84 Web Mercator aux sphere (WKID 102100/3857) and (via Pro) you overwrite this with a new version that uses a different spatial reference (e.g. GDA94 (WKID 4283)), it appears that the spatial reference updates ok.
HOWEVER, if that layer has hosted views, it doesn't appear that those update to reflect those changes (at least, not according to the JSON when viewed through the Service URL).
In ArcGIS Pro, the layers both show up as using the updated spatial reference.
Is this a problem? Is this something that can be done and the differences in the JSON ignored? Or is it (as I suspect) going to cause me headaches down the track?
Well, so far it all seems to be happy enough with the updated coordinate systems. Views still showing the original in ArcGIS Online's metadata, but they display correctly when loaded into Pro so thats what matters.