because in my own tax country i can have a couple test cases that should cover 99% of all transactions:
EU to Home Country:
	- B2B
		1) VAT to VAT 			=> No VAT on invoice, no reverse charge.
		2) VAT to Non-VAT 		=> VAT on invoice.
		3) Non-VAT to VAT 		=> No VAT on the invoice 
		4) Non-VAT to Non-VAT 	=> ??

	- B2C
		1) VAT 					=> VAT on invoice 
		2) Non-VAT 				=> No VAT on invoice. 

EU to other EU:
	- B2B
		1) VAT to VAT 			=> No VAT on invoice, reverse charge 
		2) VAT to Non-VAT 		=> ??
		3) Non-VAT to VAT 		=> ??
		4) Non-VAT to Non-VAT 	=> ??

	- B2C
		1) VAT 					=> VAT on invoice
		2) Non-VAT 				=> No VAT on invoice.

UK to UK: 
    - B2B
        1) VAT to VAT 			=> No VAT on invoice, no reverse charge.
        2) VAT to Non-VAT 		=> VAT on invoice.
        3) Non-VAT to VAT 		=> No VAT on the invoice.
		4) Non-VAT to Non-VAT 	=> ??
	- B2C
	    1) VAT 		=> Vat on invoice 
	    2) Non-VAT 	=> No VAT on invoice. 

UK to EU
    - B2B
        1) VAT to VAT 			=> No VAT on invoice, reverse charge
		2) VAT to Non-VAT 		=> ??
		3) Non-VAT to VAT 		=> ??
		4) Non-VAT to Non-VAT 	=> ??
    - B2C
        2) VAT 					=> ??
        2) Non-VAT 				=> ??

EU to UK
    - B2B
	    1) VAT to VAT 			=> No VAT on invoice, reverse charge
		2) VAT to Non-VAT 		=> ??
		3) Non-VAT to VAT 		=> ??
		4) Non-VAT to Non-VAT 	=> ??
    - B2C
        2) VAT 					=> ??
        2) Non-VAT 				=> ??



A note on Non-Vat registered eu businesses:
	- They may trade within their own country (b2b, b2c, no vat on the invoice, but cannot deduct vat for aquiring materials).

B2c EU:
    - Can be done up to a 10.000 euro threshold.  => like local regulation.

Special on this:
    - Can register for eu vat only, so they trade as a non vat registered busienss locally, have a tax id and use the VAT/Moss scheme for  only for their eu b2b and b2c transactions. 

So they would be test home country test case B2b-3, B2C-2 as well as .EU B2B-1 and B2C-1

https://europa.eu/youreurope/business/taxation/vat/vat-exemptions/index_en.htm#shortcut-2
https://ec.europa.eu/taxation_customs/business/vat/action-plan-vat/vat-scheme-for-small-businesses_en