How To Fix DT490 - Key with inverted individual definition must contain at least 2 columns

SAP Error Message - Details

• Message type: E = Error

• Message class: DT - Table activation (incl. indexes)

• Message number: 490

• Message text: Key with inverted individual definition must contain at least 2 columns

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message DT490 - Key with inverted individual definition must contain at least 2 columns ?

  The SAP error message DT490, which states "Key with inverted individual definition must contain at least 2 columns," typically occurs in the context of defining a data structure or a database table where a key is defined incorrectly. This error is related to the use of inverted individual definitions in the context of data modeling, particularly in the ABAP Dictionary.
  Cause:
  The error arises when you attempt to define a key for a table or structure using an inverted individual definition (which is a specific way of defining keys in SAP) but have specified only one column in the key. Inverted individual definitions require at least two columns to function correctly. 
  Solution:
  To resolve this error, you should:
  
  
  Check Key Definition: Review the key definition for the table or structure where the error occurred. Ensure that you have defined at least two columns in the key.
  
  
  Modify Key Fields: If you have only one column defined as the key, you need to add another column to the key definition. This can be done by:
  
  Going to the Data Dictionary (transaction SE11).
  Opening the relevant table or structure.
  Modifying the key fields to include at least two columns.
  
  
  
  Save and Activate: After making the necessary changes, save and activate the table or structure to ensure that the changes take effect.
  
  
  Related Information:
  
  
  Inverted Individual Definition: This is a specific type of key definition in SAP where the key fields are defined in a way that allows for more complex data retrieval and integrity checks. It is often used in scenarios where the uniqueness of records is determined by a combination of multiple fields.
  
  
  Data Dictionary (SE11): This is the transaction code used to access the Data Dictionary in SAP, where you can create and modify database tables, views, data elements, domains, and more.
  
  
  Key Fields: In SAP, key fields are used to uniquely identify records in a table. Properly defining key fields is crucial for data integrity and performance.
  
  
  If you continue to experience issues after making these changes, consider checking SAP Notes or consulting with your SAP Basis or ABAP development team for further assistance.