Difference in Amount in GR and PO

PO details

1. with ACCt Asign Cat P(project)/ K - cost centre

2. of text material (no mat master)

3. Qty 1 EA price 330.0 Rs.

4. No GR based INv (indicator is off)

GR done first.

Qty is 1 EA (each)

Amount is shown as 1.06 Rs.

IR is done after GR

A. Invoice

QTY 330.0 Each

Price 330.0

Tax rate is 6 %

Total amount is 330+1.06*330 = 349.8

B. Credit Memo

Qty. 330 EA

Price 349.8

This is done to reverse the earlier mistake

C. Invoice (again with corrected entries)

Qty. 1 EA

Price 330+1.06*330 = 349.8

Now in PO history mat docs and IR docs are shown.

In Amount in LC field amount is showing as 1.06 Rs.

There was no modifications after creation of PO.

Any suggestion where is the problem??