How To Fix WS379 - Duplicate entry in internal table &1

SAP Error Message - Details

• Message type: E = Error

• Message class: WS - Supplier Billing Document

• Message number: 379

• Message text: Duplicate entry in internal table &1

What causes this issue?

An internal error occurred.

System Response

The system ignores this error are restores the status prior to
archiving.

How to fix this error?

Contact your system administrator.

Procedure for System Administrators

Please contact SAP. Duplicate entries exist in an archiving object.
These are usually due to incorrect documents. If, for example, the
header of a supplier settlement list and a document in this refer to the
same document condition, the document condition is included in the
archiving object twice. Retrieval of data is not affected by this.
The error relates to table &V1&.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message WS379 - Duplicate entry in internal table &1 ?

  Certainly! Here's a detailed explanation of the SAP error message WS379 - Duplicate entry in internal table &1:
  
  Error Message
  WS379: Duplicate entry in internal table &1
  
  Cause
  This error occurs when an ABAP program tries to insert or append a record into an internal table that is defined as a sorted or hashed table with a unique key, and the entry being inserted already exists in the table. 
  In other words, the internal table does not allow duplicate entries for the key fields, and the program logic attempts to add a duplicate key, causing the runtime error.
  
  When does it typically occur?
  
  When using INSERT statement on a sorted or hashed internal table with a unique key.
  When using COLLECT or other operations that implicitly try to insert duplicate keys.
  When the program logic does not check for existing entries before inserting.
  When internal tables are used to store unique sets of data but the uniqueness is violated.
  
  
  Solution
  
  
  Check the program logic:
  
  Ensure that before inserting a new entry into the internal table, the program checks whether the entry already exists.
  Use statements like READ TABLE or LOOP AT with a key to verify if the entry is present.
  
  
  
  Use appropriate internal table types:
  
  If duplicates are allowed, consider using a standard table instead of a sorted or hashed table.
  If uniqueness is required, ensure the program logic enforces it.
  
  
  
  Modify the insert logic:
  
  Use INSERT ... FROM ... TRANSPORTING NO FIELDS or APPEND if duplicates are allowed.
  Use COLLECT carefully, as it sums numeric fields but requires unique keys.
  
  
  
  Debugging:
  
  Use the debugger to check the contents of the internal table before the insert.
  Identify which key fields are causing the duplication.
  
  
  
  Example check before insert:
  READ TABLE itab WITH KEY key_field = value TRANSPORTING NO FIELDS.
  IF sy-subrc <> 0.
    INSERT value INTO TABLE itab.
  ELSE.
    " Handle duplicate case
  ENDIF.
  
  
  
  Related Information
  
  
  Internal Table Types:
  
  Standard Table: Allows duplicates, no sorted order.
  Sorted Table: Sorted by key, no duplicates allowed if unique key specified.
  Hashed Table: Hashed by key, no duplicates allowed.
  
  
  
  SAP Notes and Documentation:
  
  Check SAP Help for internal tables and their behavior.
  SAP Notes related to WS379 may provide specific fixes if this error occurs in standard SAP programs.
  
  
  
  Performance Considerations:
  
  Using hashed tables is efficient for lookups but requires unique keys.
  Always ensure data integrity before inserting into hashed or sorted tables.
  
  
  
  
  Summary
  
  
  
  Aspect
  Description
  
  
  
  
  Cause
  Attempt to insert duplicate key entry in a unique-key internal table (sorted or hashed).
  
  
  Solution
  Check for existing entries before insert; adjust table type or logic to prevent duplicates.
  
  
  Related
  Internal table types, ABAP insert/read statements, SAP Notes on WS379.
  
  
  
  
  If you provide the specific program or code snippet where this error occurs, I can help you with a more tailored solution.