How To Fix WJ204 - Current line &1 already exists in line &2: duplicated key

SAP Error Message - Details

• Message type: E = Error

• Message class: WJ - Additionals

• Message number: 204

• Message text: Current line &1 already exists in line &2: duplicated key

What causes this issue?

While creating <GL:additional>additionals</>, you have entered data in
line &V1& that already appears as a <ZH>key</> in line &V2&.
No single combination of sales unit, <GL:class_type>class type</>,
<GL:class>class</> and additional may appear more than once in the
table. This combination forms the (primary) key, that must always be
unique.

How to fix this error?

Check your entries in the current line for the
Sales unit
Class type
Class
Additional
Note:
It is not possible to define more than one
<DS:GLOS.procedure_for_additionals>procedure for affixing an additional
</> per combination of additional, sales unit, class type and class.

Error message extract from SAP system. Copyright SAP SE.

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• What is the cause and solution for SAP error message WJ204 - Current line &1 already exists in line &2: duplicated key ?

  SAP Error Message:
  
  WJ204 Current line &1 already exists in line &2: duplicated key
  
  Cause:
  This error occurs when you try to create or update a record in a table or internal table where the key fields must be unique, but the system detects that the key you are trying to insert or update already exists. In other words, there is a duplicate key conflict.
  
  The message indicates that the current line number (&1) you are processing has the same key values as another line (&2) already present.
  This typically happens during data upload, batch input, or internal table processing where uniqueness of keys is mandatory.
  Common scenarios:
  
  Attempting to insert a record with a primary key that already exists.
  Internal table processing where duplicate keys are not allowed.
  Data migration or batch input sessions where duplicate entries are present.
  
  
  
  
  Solution:
  
  
  Check the Data for Duplicates:
  
  Review the data you are trying to upload or process.
  Identify duplicate entries with the same key fields.
  Remove or correct duplicates before processing.
  
  
  
  Modify the Program Logic:
  
  If you are programming, ensure that before inserting a new record, you check if the key already exists.
  Use READ TABLE with WITH KEY to check for existing entries.
  Avoid inserting duplicates by skipping or updating existing entries.
  
  
  
  Use Proper Key Fields:
  
  Verify that the key fields used to identify uniqueness are correctly defined.
  Sometimes, incorrect key definitions cause false duplicates.
  
  
  
  Debugging:
  
  Use the debugger to check the values of the key fields at the time of the error.
  Identify which lines (&1 and &2) are conflicting.
  
  
  
  Data Cleansing:
  
  If the error occurs during data migration, cleanse the source data to remove duplicates.
  Use tools like SAP Data Services or manual checks.
  
  
  
  
  Related Information:
  
  Message Class: WJ2 (related to workflow or batch input processing)
  Typical Context: Batch input sessions, data migration, internal table processing.
  SAP Notes: Search SAP Support Portal for notes related to message WJ204 for specific module or scenario.
  ABAP Code Example:
  
  READ TABLE itab WITH KEY key_field = lv_key TRANSPORTING NO FIELDS.
  IF sy-subrc = 0.
    " Duplicate key found, handle accordingly
    MESSAGE WJ204 WITH sy-tabix lv_existing_line.
  ELSE.
    " Insert new entry
    APPEND new_line TO itab.
  ENDIF.
  
  Summary:
  
  Cause: Duplicate key detected during insert/update.
  Solution: Remove duplicates, check keys before insert, cleanse data.
  Check: Data source, program logic, key definitions.
  
  If you provide the context (module, transaction, or program), I can help with more specific guidance.