when a document of record is submitted by employee and sent for approval to the approver and he send

when a document of record is submitted by employee and sent for approval to the approver and he sends it back to the employee and request more information. When the emloyee sends it back for approval after adding more details the transaction does not route to the approver(HR) and the HR cannot see approve or reject button , rather its routed back to the employee and the employee can see the approve or reject button. how to rectify this