Not able to create PO with Item

Summary: I am getting an error message: "FND_CMN_INVALID_ATTRB_API_SERV" and an error text: "The value of the attribute ITEM_ID isn't valid."
I am getting the above error while trying to create a purchase order from a spreadsheet. I am also not able to pick the item from the UI. Not that the Items are created on the system and are correctly mapped to the respective Inventory Organization.

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