Tax information as a swiss contributor

Dear Envato Contributors,

I have a problem with the filling of tax information as a swiss contributor. We in Switzerland don’t have tax identification numbers as individuals, but in the form I must put a number in the Foreign Tax Number section otherwise I will be subject to a 30% withholding rate on the Us sales even my land has an agreement with Us with withholding of 0%.

Any Swiss authors here?

Thank you for helpful answers