When I Put A Purchase Receipt Its Qty And Rate are give some wrong Total?

When I Put A purchase recipt qty and rate are give a wrong total …what float precision Set For Correct total???

Are displaying wrong float precision of Total amount ?
Please give example .

Please share screenshots (via Imgur) of the error.

The total qty is 400 kg. Ikg rate is Rs.6.135.Then Total Calculation Is 2456 Its Show on Image…But When i Put A Manual calc For this Same Qty And Same Then Total Amount RS.2454.
How Its Possible??

You have to set precision as 3 for Rate field. You can do that form Customize Form.

Yeah I Am Already set in 3 only…(float precision)