I'm following the instructions here - Extend the healthcare case table
But when I go to my new table and try to create a Healthcare Case I see the following error at the top of the screen:
Access to api 'put(<name of extension table>.contract)' from scope 'sn_customerservice' has been refused due to the api's cross-scope access policy.
I've looked on Support for a similar error message and come across KB0863681 with a similar error message, but the cause seems to imply that that a Case table is not designed by ServiceNow to be extended, which contradicts the instructions in my first link.
