As a buyer, I need to configure tax values for suppliers in specific countries. How can I do this?

1. Login to your SAP Business Network Buyer Account
2. Click [User Initials] > Manage Profile
3. Click Country-based Invoice Rules
4. Select a country from the drop-down menu and click Add Country Rules.
5. Enable rule Require suppliers to choose from your list of valid tax values.
6. Click Yes > Configure.
7. Click Create and create a tax category for this country.
8. Click OK.
9. Save.

For default tax category settings, refer to How do I configure tax categories for my suppliers to choose from when invoicing?

SAP Business Network for Procurement & Supply Chain > Transaction Documents > Transaction (Invoicing)