Requisition Workflow Kicks Off When Req is On-Hold

We have had the same process in place for entering requisitions for more than a few years.  The Requestor is selected, the 'Hold from Processing' check box is checked and some additional information is added  to the req before it is Saved.  Our purchasing dept has brought to our attention that when the requisition is on Hold and Saved, the approvers are receiving an Approval email.  When the link in the email is opened and they attempt to approve the req, a message pops up indicating the requisition is not available for Approval since the req is On Hold.  This