You can use ME2N Report and follow these inputs to get the list of Purchase Orders created by a specific user. You can use PLANT CODE or PO DOCUMENT TYPE OR DOCUMENT DATE based on your requirement.
Go to ME2N Transaction and then input
- Click on the Dynamic Selections button
- Expand the folder “Purchasing Document Header”
- Double click on Created by to get the popup
- Now, you can input the required User ID(s). And then click on Execute button to get the Purchase Orders which are created by specific user

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Ganesh