Tax code issue

Hi,

When i m trying to park invoice thru T code MIR7 and select tax code R0 _ 14% service tax and 0.5% SB . Its calculating wrong value .

I have checked FV11 , all Condition Value is maintained properly . IF I changed invoice Qty i .e 1 then value is coming correct for tax code .

I have checked Tax condition there is NO QTY relation .

Pls check screen shot for the same, first with correct invoice QTY where value is coming wrong and second when i change Invoice qty 1 then value is correct.

Pls advice for the same.