Is issuance of Credit Note and Debit Note a two way process?

I .If you want to deal the transaction in accordance with the actual Contract of supply , you can generate a debit note for the execess Quantity with showing reasonable covering Letter , because your firm is a psu .

2. you can demand a New Invoice showing the actual Quantity as per your contract and.

if you have any future supply for the same goods , then you can also demand one delivery note for the excess supply of goods already supplied .

Excess supply of goods can be adjusted in the future supply.

3.payment should be considered as per the new Invoice of the actual Quty of goods.