link to ‘Compare to Original PO ‘ – I receive the error that I do not have privileges

Custom Responsibility to PO Inquiry causes error - "You have insufficient privileges for the current Operation. Please contact your System Administrator."
Navigation : XXX PO Inquiry ALL(Resp) > Purchase Orders > PO Change History 

To resolve this issue -

We need to add function ‘View Purchase Order History’ to Custom Menu : XXXX:PO_PURCHASE_ORDERS_GUI_B.