How To Fix LOP004 - Embedded list item already exists for the reference object key &1

SAP Error Message - Details

• Message type: E = Error

• Message class: LOP - Logistical contract options

• Message number: 004

• Message text: Embedded list item already exists for the reference object key &1

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message LOP004 - Embedded list item already exists for the reference object key &1 ?

  The SAP error message LOP004 indicates that there is an attempt to create or modify an embedded list item in a reference object, but the item already exists. This typically occurs in the context of SAP Logistics or when dealing with embedded lists in various SAP modules.
  Cause:
  The error is triggered when:
  
  You are trying to add an item to an embedded list (like a list of items in a sales order, purchase order, etc.) that already contains an entry with the same key.
  The reference object key (&1) indicates the specific object (like a document number or item number) that is causing the conflict.
  
  Solution:
  To resolve the LOP004 error, you can take the following steps:
  
  
  Check Existing Entries: 
  
  Review the embedded list for the reference object to see if the item you are trying to add already exists. You can do this by navigating to the relevant transaction and checking the details of the object.
  
  
  
  Modify Existing Entry:
  
  If the item already exists and you need to update it, consider modifying the existing entry instead of trying to create a new one.
  
  
  
  Remove Duplicate Entries:
  
  If there are duplicates that should not be there, you may need to delete the unnecessary entries from the embedded list.
  
  
  
  Review Input Data:
  
  Ensure that the data you are trying to input does not inadvertently create a duplicate. Check for any logic in your program or transaction that might be causing the same item to be added multiple times.
  
  
  
  Consult Documentation:
  
  Refer to SAP documentation or help resources for the specific module you are working with to understand the constraints and requirements for embedded lists.
  
  
  
  Debugging:
  
  If you are a developer or have access to technical support, consider debugging the process to identify where the duplicate entry is being generated.
  
  
  
  Related Information:
  
  Transaction Codes: Depending on the context, you may be using transaction codes like VA01 (Create Sales Order), ME21N (Create Purchase Order), etc.
  SAP Notes: Check SAP Notes for any known issues or patches related to this error message.
  Support: If the issue persists, consider reaching out to your SAP support team or consulting with SAP Community forums for additional insights.
  
  By following these steps, you should be able to identify the cause of the LOP004 error and implement a solution to resolve it.