How To Fix CDSUI003 - Attribute &1 is defined more than once

SAP Error Message - Details

• Message type: E = Error

• Message class: CDSUI - Central Data Source UI messages

• Message number: 003

• Message text: Attribute &1 is defined more than once

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message CDSUI003 - Attribute &1 is defined more than once ?

  The SAP error message CDSUI003 indicates that there is a problem with the definition of a Core Data Services (CDS) view, specifically that an attribute is defined more than once within the same context. This typically occurs when you have duplicate field names in the SELECT statement of your CDS view or when you are trying to define the same field multiple times in the projection list.
  Cause:
  
  Duplicate Field Names: The most common cause is that the same field is being selected multiple times in the CDS view definition.
  Join Conditions: If you are joining multiple tables and they have fields with the same name, and you do not alias them properly, it can lead to this error.
  Inconsistent Aliasing: If you are using aliases for fields but have not done so consistently, it can also result in this error.
  
  Solution:
  
  
  Check the SELECT Statement: Review the SELECT statement in your CDS view definition. Ensure that each field is only selected once. If you need to include the same field from different tables, use aliases to differentiate them.
  Example:
  SELECT field1, field2 AS field2_table1, field2 AS field2_table2
  FROM table1
  JOIN table2 ON table1.id = table2.id
  
  
  Use Aliases: If you have fields with the same name from different tables, use aliases to avoid conflicts.
  Example:
  SELECT a.field1, b.field1 AS field1_b
  FROM table_a AS a
  JOIN table_b AS b ON a.id = b.id
  
  
  Review Join Conditions: Ensure that your join conditions are correctly defined and that you are not inadvertently selecting the same field from multiple tables without proper aliasing.
  
  
  Check for Inherited Fields: If you are using associations or annotations that might inherit fields, ensure that you are not unintentionally duplicating fields.
  
  
  Related Information:
  
  CDS Views: Core Data Services (CDS) is a framework for defining semantically rich data models in SAP. Understanding how to properly define and manage these views is crucial for effective data modeling.
  SAP Documentation: Refer to the official SAP documentation for Core Data Services for best practices and guidelines on defining CDS views.
  Debugging Tools: Use the ABAP Development Tools (ADT) in Eclipse or the SAP HANA Studio to help identify issues in your CDS view definitions.
  
  By following these steps, you should be able to resolve the CDSUI003 error and ensure that your CDS view is correctly defined without duplicate attributes.