Regarding the attachments in PO form

Hi,

I have a requirement not to allow any other user except the user (who is creating PO) to open the attached documents.

To find the attached documents we have to choose attachments (present in the menu of PO form in yellow colour), then a form opens and we can see open documents button as below.

I tried disabling the button through form personalization but it was not working.

So, I tried to disable it by navigating to help -->diagonise  --> properties --> items  and changed the property to disable. This worked , but the button is disabled to all the users, where as I want it to