PO PDF Email not sent to Supplier when PO is fully approved

Summary:

PO PDF Email not sent to Supplier when PO is fully approved

Content (required):

PO PDF Email not sent to Supplier when PO is fully approved. However when when use 'PO->Actions->Communicate' then PO PDF email is sent out. Any thoughts why PO PDF email is not sent out once PO is fully approved.

Setup:

We have 2 custom templates.

1) Master Template ( that is assigned to Purchase Order document Type). This template is used to call the actual layout template.

for ex: if Supplier Country is 'IT' ( Italy) then call Italy Layout Template

2) Country-specific template.

Version (include the version you are using, if applicable):