Hi
"VAT Reg. No." is a field name on the Contact Record. You should find out, if that field is properly defined on the form template. To do this, you need to go to Marketplace and activate Forms in-app. This will activate a Form Templates register in System module. Go to that register and find a form that is used to print invoices and open it. Check if there is a field with name "Customer VAT Reg.". If not, then add it by clicking on Field button, draw the field on the template and use Paste-Special function to choose "Customer VAT Reg.". Remember to save the template after changing it.
You can find more information about form templates in this video:
https://www.youtube.com/watch?v=wEaxtS9A7sA?autoplay=1
Best Regards,
Olga
HansaWorld Support