How SALES_TAX OrderAdjusments are created first time

[Raj Saini]

Hi,

I am having rounding problem for UK VAT and trying to find how SALES_TAX 
type order adjustments for Cart/Order line items are created. I have 
been struggling for couple of hours but could not trace this piece of 
code. I could trace that these adjustments are in 
CartShipInfo.CartShipItemInfo.itemTaxAdj list but not able to find how 
are they stored first time. It will be a great help if someone can point 
me to the code.

Thanks in advance.

Raj