Message type: E = Error
Message class:  APPL_MM_PUR_PO - Message Class for Purchase Order 
Message number: 020
Message text: You are not authorized to copy purchase order &1
Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of messages in the SAP system have a message text, however this is frequently insufficient to comprehend or resolve the problem.
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The SAP error message APPL_MM_PUR_PO020, which states "You are not authorized to copy purchase order &1," typically occurs when a user attempts to copy a purchase order but lacks the necessary authorizations to perform that action. Here’s a breakdown of the cause, potential solutions, and related information:
Cause: Authorization Issues: The user does not have the required authorization objects to copy purchase orders. This could be due to missing roles or permissions in their user profile. Role Configuration: The roles assigned to the user may not include the necessary permissions for the specific transaction or action they are trying to perform. Transaction Code Restrictions: The transaction code used to copy the purchase order may have restrictions based on user roles.
Solution: Check User Authorizations: Use transaction code SU53 immediately after the error occurs to check which authorization check failed. This will provide insight into what specific authorization is missing. Alternatively, you can use transaction code SU01 to view
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