Here you can specify a VAT business posting group for customers for whom you want the item price including VAT, as shown in the Unit Price field, to apply.
If the item is purchased by a customer from a different VAT business posting group, the program will automatically calculate a new unit price. The program will subtract the VAT from the current unit price and then recalculate VAT based on both the VAT business posting group to which this customer belongs and the VAT product posting group to which the item belongs.
To see the VAT business posting groups in the VAT Business Posting Groups window, click the AssistButton to the right of the field.
You should not complete the VAT Bus. Posting Gr. (Price) field unless there is a check mark in the Price Includes VAT field.