What type of changes generally comes after release of a PO?

Once a purchase order is released, the vendor is required to execute the order as per terms of order as defined in it. 

However at times it is seen that there could be changes which might have taken place after the PO was released. This could be both from from Vendor side as well as the buyer side. Some typical changes could be :

Buyer side :

1. The qty ordered need to be increased.
2. The buyer need the material earlier than the delivery date specified.
3. The payment term need changes as buyer is not able to provide certain documents.
4. Buyer would like to add some more conditions.
5. The description need some additional information etc.

Vendor side :

1. The price no more valid as the order was released after the quotation validity expired.
2. The vendor is facing shortage of raw material and he wants the delivery schedule to be changed.
3. Vendor is offering some alternate materials or different make.
4. The payment term is no more acceptable as the prices have been revised.  etc, etc...

In all such cases fresh communications are exchanged between the two parties and changes are made as per mutually agreed terms. In SAP the changes like qty, price, delivery date, payment term, pricing conditions etc can be tracked as changes in the document. 

SAP does not have PO amendment but some companies are developing different layout for their orders based on above changes.

SAP MM Tips by : Sushanta Ghosh

See also
Contract, Pipeline, Third-Party, Subcontract, Consignment

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