Hi there!
I got an issue.I recently upgraded to Magento 1.9 and now the vat id that was in the Account information did not appears in the invoices,it appears that it has to be set in billing address to appear in invoice. There is a way to populate the vat id field in billing adress with the vat id field from account information, automatically? or, there is a way to make appear the vat id form the account info in the invoice? Thx