Adding attributes from data model to Supplier UI

Hi Experts,

I am adding attributes on Supplier UI that are existing in Data Model but not on Supplier UI using UI Customization .

There are some attributes like Withholding Tax Type, Withholding Tax ID, Exemption %, Exemption Reason, Exemption Start Date etc, that are there in Data Model but I cannot see those attributes in 'ELEMENT' List in UI Customization, Hence I am not able to add those attributes to the UI.

Please refer to the below screenshot of UI customization screen where 'ELEMENT' button is available to add attributes on UI:

Kindly help me in resolving the issue.

Regards,