How To Fix W_CB378 - Order key &1 was used more than once

SAP Error Message - Details

• Message type: E = Error

• Message class: W_CB -

• Message number: 378

• Message text: Order key &1 was used more than once

Self-Explanatory Message

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• What is the cause and solution for SAP error message W_CB378 - Order key &1 was used more than once ?

  SAP Error Message:
  
  W_CB378 Order key &1 was used more than once
  
  Meaning / Cause:
  This warning message occurs when the same order key (also called order number or order ID) is used multiple times in a context where it must be unique. Typically, this happens during data entry, order creation, or data upload processes where the system expects each order key to be unique but finds duplicates.
  Common scenarios include:
  
  Uploading or creating multiple sales or production orders with the same order number.
  Data migration or batch input sessions where the order key is repeated.
  Custom programs or interfaces that do not properly generate unique order keys.
  Manual entry errors where the user accidentally reuses an existing order key.
  
  
  Explanation:
  In SAP, order keys (such as sales order numbers, production order numbers, or purchase order numbers) are unique identifiers for documents or transactions. The system uses these keys to track and manage orders. If the same key appears more than once in a process that requires uniqueness, SAP raises this warning to prevent data inconsistencies or overwriting.
  
  Solution / How to Fix:
  
  
  Check for Duplicate Entries:
  
  Review the data or input file to identify where the order key is duplicated.
  Remove or correct duplicate entries so that each order key is unique.
  
  
  
  Ensure Unique Order Key Generation:
  
  If the order keys are generated by a program or interface, verify the logic to ensure it produces unique keys.
  Use SAP number ranges or standard order number generation mechanisms to avoid duplicates.
  
  
  
  Data Upload / Batch Input:
  
  When uploading data via LSMW, BAPIs, or other tools, ensure the source data does not contain duplicate order keys.
  Validate the input file before processing.
  
  
  
  Manual Entry:
  
  If the error occurs during manual entry, check if the order key already exists in the system.
  Use transaction codes like VA03 (Display Sales Order), CO03 (Display Production Order), or ME23N (Display Purchase Order) to verify existing orders.
  
  
  
  Check Custom Code:
  
  If custom developments are involved, debug or review the code to ensure order keys are assigned uniquely.
  
  
  
  
  Related Information:
  
  
  Transaction Codes:
  
  VA01 / VA02 / VA03 – Sales Orders
  CO01 / CO02 / CO03 – Production Orders
  ME21N / ME22N / ME23N – Purchase Orders
  
  
  
  Number Range Objects:
  
  Sales Orders: VBAK-VBELN
  Production Orders: AUFNR
  Purchase Orders: EBELN
  
  
  
  SAP Notes / Documentation:
  
  Check SAP OSS Notes related to order number duplication issues.
  Review SAP Help Portal for order management and number range configuration.
  
  
  
  
  Summary:
  
  Cause: Duplicate use of the same order key in a context requiring unique keys.
  Solution: Identify and remove duplicates; ensure unique order key generation; validate input data.
  Check: Existing orders, number range settings, and custom code logic.
  
  
  If you provide the specific module or transaction where this error occurs, I can give more tailored advice.