How to fix SAP error ME285?

What causes this issue? No confirmation control key has been maintained in item &V2& of purchase order &V1&.System Response The system issues an error message and will not allow you to continue with this transaction until the error is resolved. How to fix this error? Enter a confirmation control key on the item detail screen of the purchase order (this is only possible if no goods receipt has yet been posted):Error message extract from SAP system. Copyright SAP SE.

How To Fix ME285 - This function only possible for items with confirmation key

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ME285 - Overview

Message type: E = Error
Message class: ME - Purchasing: General Messages
Message number: 285
Message text: This function only possible for items with confirmation key
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What causes this issue?
No confirmation control key has been maintained in item &V2& of
purchase order &V1&.
System Response
The system issues an error message and will not allow you to continue with this transaction until the error is resolved.
How to fix this error?
Enter a confirmation control key on the item detail screen of the
purchase order (this is only possible if no goods receipt has yet been
posted):

Error message extract from SAP system. Copyright SAP SE.

ME285 - Details

Error Code: ME285
Error Message: This function only possible for items with confirmation key

Summary
This error occurs when you try to perform a function on a purchase order item that requires a confirmation key, but the item does not have one assigned. Essentially, the system restricts certain confirmation-related processes to items flagged for confirmations.

Root Causes
The purchase order item is not configured to require confirmations (missing confirmation key in item details).
User attempts to create or process confirmations for items that are not set up for confirmation tracking.
Incorrect or incomplete master data in the purchase order item, especially missing confirmation control settings.
System configuration or customization does not link the confirmation key to the relevant item category or item.
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