Have you looked these tables :
Sales invoice lines : VAT Amount and VAT %
VAT Entry : your invoice no
if in both table your VAT value not found then perhaps something wrong with your sales header before post. Or maybe some customer record / Item Record override your VAT field in sales header.
Comments
This is the training material for NAV 2009, looks slightly different due the pages instead of the forms but underneath that part of NAV has remained basically the same.
http://www.pardaan.com/wp-content/uploads/downloads/2010/04/NAV%202009%20-%20Set%20Up%20Posting%20Groups.pdf
i checked this setup - everything is OK.
VAT % is OK.
today i have the same situation, but in other Customer.
Sales invoice lines : VAT Amount and VAT %
VAT Entry : your invoice no
if in both table your VAT value not found then perhaps something wrong with your sales header before post. Or maybe some customer record / Item Record override your VAT field in sales header.