PO_REQAPPROVAL_INIT1.EMAIL_DOC_YES_NO returns always Yes in R12.What criterias does it consider?

PO_REQAPPROVAL_INIT1.EMAIL_DOC_YES_NO returns always Yes in R12.What criterias does it consider?

IN 11i when we are updating a PO doc (through some loader process),revision of PO gets increased but everytime the supplier doent get mails.

But in R12 everytime when a revision increases,mails are sent to suppliers.

On checking i found that Does User want document e-mailed node return N in 11i whereas it return Y in R12.

this node belong to PO Approval workflow belongs Email PO Change Order Process

Please help us in finding what might be the difference,i tried comparing 11i and R12 pkg but there are lot of differences