How To Fix WX478 - An entry with the same key already exists

WX478 - Overview

• Message type: E = Error

• Message class: WX - Master data maintenance: Plant

• Message number: 478

• Message text: An entry with the same key already exists

Self-Explanatory Message

Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of messages in the SAP system have a message text, however this is frequently insufficient to comprehend or resolve the problem.

To make things easier, more detailed information is frequently added to describe the issue, how to fix it, and the necessary steps or configuration modifications.

Unfortunately, there isn't any extra information in this error notice.

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Smart SAP Assistant

• What is the cause and solution for SAP error message WX478 - An entry with the same key already exists ?

  Certainly! Here's a detailed explanation for the SAP error message WX478: "An entry with the same key already exists":
  
  Error Message
  WX478: An entry with the same key already exists
  
  Cause
  This error occurs when an attempt is made to insert or create a record in an internal table, database table, or data structure where the key fields of the new entry already exist. In other words, the system is trying to add a duplicate entry with a key that must be unique.
  Common scenarios include:
  
  Inserting a duplicate entry into an internal table declared with a unique key.
  Trying to create or update a database record where the key fields violate uniqueness constraints.
  Using function modules or BAPIs that internally check for unique keys and detect duplicates.
  When working with SAP GUI controls or ALV grids, this error can also appear if the underlying data contains duplicate keys.
  
  
  Solution
  To resolve this error, you need to ensure that the key