A mischarge correction is when the wrong account line was used or the wrong amount was entered. The account that was wrongly charged needs to be credited and the correct account needs to be debited. The information needs to be recorded and duly noted for your office and for the main office. A journal voucher, showing the correction, should be completed as soon as possible. The accountswill not balance at the end of the fiscal year if these corrections are not properly made.
For material/Goods Purchases, the Po is required. In the Po, QTY, Product Name, Where is delivery price, Terms and Conditions. In the po there is no matter of final amount. It is just the approximate amount.