Is there any option in Oracle EBS 12.2 to "Hide" PO numbers until the PO is approved?

Details of the Requirement:

1. The customer wants to hide the PO number from Buyer Work Centre, Oracle Forms and reports until the PO is fully approved.
2. The customer wants this to be role based, so that anyone having superuser access can see the PO numbers, but not any other person.

Is there any setup option in Oracle EBS using which this can be achieved? Mainly the 1st requirement.

Other option is to develop form personalizations, oaf personalizations and modification to the report logic. But before that we are checking if there is any seeded option for this.

Customer is using EBS R12.2.12.