The Financial role 'Approver' allows you to set a user to approve Purchase Invoice Register invoices in the Approve Application without having access to the Accounts data.
Before the user is set as an Approver, they must first be assigned the appropriate permissions in Financials:
In the Members area, locate the user, click the popover button in the top right-hand corner of their record and select Manage Roles.
In the Financials appropriate dataset, choose **User** and click **Save Changes**.
Go to Financials and set the relevant Approval Permissions for the user.
Return to the Members area and repeat steps 1 to 3, setting the role to **Approver**.