Restricting Access to a certain page/button Role Wise

Dear All,

We are using PSFSCM 9.2 PT 8.53 and zero image. We've customized our purchase order print button i.e. view printable version by disabling it on the PO_LINE page by using the following command:

/*CODE FOR DISABLE PRINT BUTTON*/

PO_PNLS_WRK.PRINT_BTN.Enabled = False;

So, now our purchase order view printable version is disabled, review below screenshot highlighted. Would like to enable it for certain users how to achieve this i.e. it will remain disable for the majority of the users but for certain users we would like to enable it by assigning them a certain role. I hope, my query is clear any ambiguity or any further information you may require kindly don't hesitate to contact.