PO Change Order - Forward to User (PO status is automatically approved)

Currently when a Purchase order is approved, supplier has change price (negation).

Now PO is status is Require Re-approval

Now user has forward another user that PO automatically approved.

Example

Created item price : 5

supplier neg : 4

change order and status require re-approval

user has forward (PO) to another user  that PO automatically approved.

Please can you suggest us.