Approved PO mail to supplier

  When we approve a PO mail is sent to supplier that the PO is approved . Can we restrict this ? Please advise if any method is there to do this

Note :

I have tried this but failed

1. We have unchecked mail check box when we send document for approval .

2. At supplier level changed the Communication method to blank .

 

Please reply if anyone has any other way of achiving this  as this is an unintended functionality

 

Thanks ,

Venkat