Different TAX calculation in PO and MIGO

Hi Experts,

I'm facing a problem while doing MIGO.

I have created a PO with 10 quantity with net Price 100 with Account assignment category as Asset(A).

In PO --> if I'm seeing in Condition tab under item detail,  it is calculating 14.5% for the total value of PO(say 1000Rs) by Cdn type JEXS & NAVS. i.e 1000+145 = 1145.

After posting MIGO, the value of the item in quantity tab is calculated for 5.5% Say 1000+55=1055.

There are no condition records maintained for JEXS & NAVS condition types. checked in FV13, FTXP, MEK3.

I want to know

1. how it is calculating 14.5% in PO and where it is configured and how to see that percentage..?

2. Why it is calculating 5.5% in MIGO..? What is the reason and how to solve it..?

Thanks in advance,

Deeban T