NSD 7.0.2, adding a Custom Field on the Invoice Template

Hello.

I See i don t have on the fields of the Org Units the Fiscal Code / VAT. I added on the Personal Fields on Org Units

Now, i want to put this field on the Invoice Template, but its not possible to add (on Configuration -> Configuration -> E-MAIL -> Templates -> Check E-MAIL resum templates -> Invoice Summary

¿ Its possible to add a custom field on the invoice ?

Thanks in advance
Regards
Victor