Writing this one up for the community so next time someone searches they have something to find
Problem: error message shown in log when viewing an object instance. "property.PropertyViewLoader: Exception locating views for object (object_id_here) of subtype update in the database"
The object id shown is not in the database
Background: new custom object transferred by XOG
Root cause: The object had a "property view" for a non existent sub object. For some reason post deletion of the subobject a property view was left behind and came across with the object xog.
Solution: create a new subobject with the id, wait a few minutes and then delete the new sub object. Restart services if possible.
Sub object link now removed and error message no longer shown in log when viewing instance