PrestaShop/PrestaShop — pull request #633 by Seynaeve (2013-08-06 12:18:19+00:00)
Title: Allow B2B to navigate through the form with Tab

With
$('#company').blur(function(){
VAT only appears when we leave the input and therefore does not allow to navigate through the form with Tab

With
$('#company').on('input',function(){
that work

PS: You can do the same in authentication.tpl