How to create a custom role to hide Attachment field in Creation of Invoice and Manage Invoice page

AP Custom role created by removing the following privileges and Data security policies:

Privilege Name / Code :
1. Manage Item Attachment / EGP_MANAGE_ITEM_ATTACHMENT_PRIV
2. View Supplier Attachment / POZ_VIEW_SUPPLIER_ATTACHMENT_PRIV

Data Security Ploicy - Grant on Application Attachment (All 4 were removed)

Intention behind this creation of custom role is to create a role without access to attachment field in the Invoice Creation/Manage Invoice page. Above custom role assigned to a user but user could able to view the attachment field.

Hence kindly clarify how to create a custom role for the above requirement.

Thank you.