How To Fix P0204 - The same key cannot be used for two lines

SAP Error Message - Details

• Message type: E = Error

• Message class: P0 - Messages for Transactions PE01, PE02 and PE03

• Message number: 204

• Message text: The same key cannot be used for two lines

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message P0204 - The same key cannot be used for two lines ?

  The SAP error message P0204, "The same key cannot be used for two lines," typically occurs in the context of document processing, such as when creating or modifying purchase orders, sales orders, or other transactional documents. This error indicates that there is a duplication of key fields in the document lines, which violates the uniqueness constraint required by the system.
  Cause:
  
  
  Duplicate Entries: The most common cause of this error is that two or more line items in the document are trying to use the same key fields. This could be due to:
  
  Duplicate material numbers.
  Duplicate account assignments.
  Duplicate item categories.
  
  
  
  Configuration Issues: Sometimes, the configuration of the document type or item category may not allow for certain combinations, leading to this error.
  
  
  Data Entry Errors: Manual data entry errors can also lead to the same key being inadvertently assigned to multiple lines.
  
  
  Solution:
  
  
  Check for Duplicates: Review the line items in the document to identify any duplicates. Ensure that each line item has a unique combination of key fields (e.g., material number, account assignment).
  
  
  Modify Line Items: If duplicates are found, modify the line items to ensure that each one has a unique key. This may involve changing the material number, account assignment, or other relevant fields.
  
  
  Review Configuration: If the issue persists, review the configuration settings for the document type or item category in the SAP system. Ensure that the settings allow for the intended combinations of line items.
  
  
  Use Transaction Codes: Utilize transaction codes like ME21N (Create Purchase Order) or VA01 (Create Sales Order) to check the document structure and ensure that the entries are correct.
  
  
  Consult Documentation: Refer to SAP documentation or help resources for specific guidelines related to the document type you are working with.
  
  
  Seek Support: If you are unable to resolve the issue, consider reaching out to your SAP support team or consulting with an SAP expert for further assistance.
  
  
  Related Information:
  
  SAP Notes: Check SAP Notes for any known issues or patches related to this error message.
  Transaction Logs: Review transaction logs for additional context on when and why the error occurred.
  User Training: Ensure that users are trained on proper data entry practices to minimize the occurrence of this error in the future.
  
  By following these steps, you should be able to identify the cause of the P0204 error and implement a solution to resolve it.