I found the following Notes for pre-requisites on Profile Options and Offering setups.
However I need to understand how best to manage these on the supplier database level?
Q1: Should the contacts be always assigned to an address associated with site? for Contacts to populate on Non Catalog Request selection?
Q2: How can a requestor override the email address defaulted from a Contact?
Q3: what is the defaulting logic for email addresses to send PO PDF to supplier ?
Q4: if no contact was selected, can we send it to a specific email address during Non Catalog Request stage?
Q5: Does "Communication Method" has to be always set as "yes" at site level?
If so, in what situation would this email address take priority?