How to Change a Purchase order

To access using menu:
Logistics -> Material Management -> Purchasing -> Purchase Order -> Change
To access using TCODE:
ME22N
The entry process to “Change Purchase Order”:
Click “Other Purchase Order”/SHIFT + F5 Icon to select the purchase order number you want to change/update.

On the next screen, you can start to change the purchase order data.

PO Quantity: Type in the PO quantity
Net Price: Price per unit
Tab “Header Text”: Additional text for the PO
Tab “Header Delivery/Invoice” : Fill in with Payment data, Incoterm, Currency.
Tab “Header Org” : Fill in with Purch Org, Purch group, company code.
You can also check other parameters to fill based on your specific needs.
Click CTRL + S to save the changes.
Click the “Other Purchase Order” / SHIFT + F5 to change another PO.