Thank you for your reply BJ Freeman.
I am not aware of USA Tax Authority, just know some basic principles. VAT
system is used by many countries. Of course, gross profit is very important
for any company and it is used in tax computation for local Tax authority.
Some VAT info you may read here:
http://en.wikipedia.org/wiki/Value_added_tax
http://en.wikipedia.org/wiki/Value_added_tax 
The main points for VAT is:
VAT amount depends on a country
Some products, materials or services can have different VAT amount per
country (but that is more exceptional case, when a government wishes to
reduce taxes for some kinds of business...)
VAT is applied for product, material or service
VAT should be specified in each order and invoice (for some countries, it is
mandatory, but for another it is a best practice)

>From these points, it is interesting to know is "VAT" the same as "Sales
tax" , I saw many discussions about this in the mail list, and as I see VAT
is the same as "Sales tax". Ok.

According to VAT, all order items and invoice items must have VAT. In OFBiz,
adjustments are additional things and services! *Shipping charge* is the
service adjustment. Fortunately, OFBiz can tax it.

Conclusion, 
for VAT users it is important to have the correct orders and invoices. They
are correct, when they have all necessary items and adjustments, plus tax
(VAT). Currently, the orders and invoices are not correct if a company use
additional adjustments (not shipping and promotion), because they can not be
taxed. To fix it,  the company must edit each order manually. When you add
additional tax for some adjustments, OFBiz makes tax recalculation according
to its internal tax model and compensate additional tax by tax deduction.
This tax deduction must be removed manually. As result ,we have manual,
unhandy and error risky tax calculation. Each order must be reworked.


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Kind regards,
Sergei
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