Permission set for Boomi integration user

Morning, we are trialling using Simple Object Designer to create APIs to include some custom objects and fields in Dynamics BC 365. We are using Boomi as the integration tool and created an OAuth2 authentication user (Service Principal) and granted this user the Super (Data) permission set. When Boomi tries to connect it is authenticating ok but getting a permissions error (see attached). Do we need to create a custom permission set for the new extension published using the Simple Object Designer? Thanks for your guidance.