I am having custom profile , I have assigned it to user , however after assigning all types of permission set and object setting to view and modify all for return order object. Return order owd is private #Security Review #Security #FSL Mobile
In a Profile or Permission Set make sure to check the "Use Order Management Return Order" system permission to be able to access Return Order Object.
This is a poorly documented behavior of Return Order object that is counter-intuitive to troubleshoot as without this permission OWD and CRUD settings are ignored.
Hope this helps!