Have you bounced the Apache after performing the changes mentioned in the note.
Please follow the steps from the below note and see if the issue gets resolved,
iProcurement Gets OAException And JBO-27122 At Non-Catalog Request (Doc ID 787125.1)
Also if the above doesn't resolve then please note that there could also be page mismatch issue and in that case raise a SR.
We are also facing the same in our Instance. and applied the metalink note also but no help. Can you please update if it is resolved now ?