How to use point of acceptance(POA) during OM and AR Transactions for place of supply rule in tax?

We want to use POA/POO for tax place of supply(POS) determination, we have a scenario where our shipments point of entry for our Swiss entity can be Germany or France. The Swiss company is registered in both Germany and France but we don't have any physical presence in both of countries. It is just routed through these countries from our shipping partners.

Since we can't use Ship-To/Bill-To/Ship-From and Bill- From to determine the POS , we want to explore the other available fields like Point of Acceptance and Point of Origin. There is an article which states that we can use it now without the service providers but it doesn't describe where and how to enter POA/POO in transaction/ customer/organization form.