What is the VAT format in Switzerland? Should it not be 0?
The VAT format has to be inputed strictly as below, depending on your language:
In FR : CHE-111.111.111 TVA
In DE : CHE-111.111.111 MWST
In IT : CHE-111.111.111 IVA
Careful : Don't forget the "TVA" in the end (or MWST or IVA).
Moreover, the VAT in Switzerland is not applied to orders as long as you give us a valid VAT number. Without VAT number, we can't verify this and have to apply it.