How do you delay the approval routing of a purchase order that is changed?

When creating a purchase change order (increasing of the value) in PeopleSoft 9.2 were the approval framework is activated it routs the approval immediately after the change is made and the purchase order is saved.  We have tried to stop it by selecting the hold option on the PO Header but that does not stop the routing of the PO in the workflow it only stops the approver the ability to approve the PO.

Does anybody know how we can stop the routing into the workflow if a user chooses to do so.