Knowledge Models in the Sustainable Spend Management app
The app uses the Purchase to Pay KM Sustainability Extension. This KM depends on the KM existing in the Procurement Starter Kit.
Action: Install the Procurement Starter Kit. Once it is installed, open the Settings of the App to add a dependency to this Procurement Starter Kit.
Publish the package (even if there are no changes visible) and you should be able to see the views working.