How do reverse charge text & vat exemption text work in Nordic Localization?

Hello

Some of the countries we operate in requires that we print certain text on invoices if we are selling items with reverse charge or zero-rated VAT.

IT seems our netsuite already has some fields in the invoice that gets text triggered in these cases. They are called Reverse charge text (custbody_sta_nord_rctext) & VAT Exemption text (custbody_sta_vat_exemption_text)

We can see they are from the nordic localization packages (Denmark localization, finland localization, sweden localization, norway localization). But there is no mention of these fields in the documentation for these localiztion packages.

Is there anyone who knows how these work?, can we control the text within them somehow? Will they apply to other nexus's than the nordics