Enter Once fields are editable in PPM New User Experience

Document ID : KB000120988
Last Modified Date : 13/11/2018
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We have fields that are enter once within Classic, however, we are finding they are editable within the Project in Project & Portfolio Management (PPM) New User Experience (UX) when they are expected to be read only.
This is working as designed. As referenced in the documentation functionality for any Studio view level settings such as Required, Enter Once, or Hidden is not available in the New UX. See 

New User Experience: Compare with Classic CA PPM for more details on this and other differences between the New UX and Classic PM.