What documents are required before verifying invoice? what is the process if the supplier passes an invoice for more amount?

Document receipt of the goods

Signed by the Keeper of  warehouse

The verification of documents start from the origin i.e.right from inquiry.

inquiry,quotations, verification and confirmation order, delivery notes, Transport receipts, Cargo related documents and their proper authentications and endorsements, the relevant copies of invoices passed through including confirmation of receipt.  Then the terms and conditions set by the supplier will be verified including the credit period...shortages of delivery of items...bills tallying with the original agreed quotation with allowable and confirmed variations (if any).  If the invoice amount is in excess...either to call for a corrected invoice or make payment of the exact amount and generate a voucher for payment with the necessary details..if difference in invoice put a note as: payment pending confirmation from supplier.  If good relationship exist between the customer pending the payments is not desirable... in this case I will take a minor risk.

Entry in the procurement bill and a note directing the sales memorandum bill 

Invoice date and the procuring entity or by application type bill 

Checking in quantity with guaranteed receipt registered in the invoice 

  Voucher or invoice payment by type 

When there is a memorandum of settlement sends error and error location of the two sides to correct the error