Purchase Order - Approval + Approved

Hi,

I am using Version 5 of ManageEngine ServiceDesk plus. I have created a Purchase order and saved.

I tried to send this PO for Approval by clicking on "Submit for Approval". It only opened another window where i have to specify the email address of the person whose approval we need.

Now my question is whose email address should come here i.e. a requestor email address or Technicians Email address.

I tried with both the options but whenever i click on the link which comes via email to either requestor/technician, it always give me page stating "Your are not authorized to view this page".

What to do now?

Please provide help on this.

Thanks
Pooja