A Custom Page in IFS Aurena needs to be based on a Projection. In this case, you can create a new projection and then create the Aurena page using that projection. Then you can grant that projection to permission sets as necessary. Presentation Objects and database objects are not relevant when it comes to Aurena pages.
Assuming you have already created the Custom LU, please refer to the following documentation to read about how to create the projection and the page:
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