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how to block purchase order all line items at a time for further process of goods receipt and invoice..etc.
Go to ME22N Purchase Order Change and Select All ICon in Item Overview after Selecting all Items Click on Lock Icon (Lock Symbol) and Save.
Now all your Purchase Order Items are Locked for Further Processing Like Goods Receipt Etc....
To unlock Select all the Line items and Click on Unlock Icon (Unlock Symbol) and Save.
You can do This Using MEMASSPO MAss Maintenance for Purchase Orders also.