If you get the following error on a View Object with a key of data type, Number:
<FacesCtrlHierBinding$FacesModel><makeCurrent> ADFv: No row found for rowKey: [oracle.jbo.Key]
Then, check the Access Mode of the View Object under General settings; the Tuning section. The Access Mode is set to Scrollable by default, but for some reason it was set to Range Paging in my case. Changing it back to Scrollable solved it for me!