How To Fix DDLS135 - Basis table & is in selection more than once; '$extension.*' not possible

SAP Error Message - Details

• Message type: E = Error

• Message class: DDLS - For DDL source handling

• Message number: 135

• Message text: Basis table & is in selection more than once; '$extension.*' not possible

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message DDLS135 - Basis table & is in selection more than once; '$extension.*' not possible ?

  The SAP error message DDLS135 indicates that there is an issue with the definition of a database table or view in the Data Dictionary (DDIC). Specifically, it suggests that a basis table is being referenced more than once in a selection, which is not allowed. The message typically arises when you are trying to create or modify a database object (like a view) that includes the same table multiple times in the selection criteria.
  Cause:
  
  Duplicate Table References: The most common cause of this error is that the same table is included multiple times in the selection list of a view or a database object.
  Incorrect Join Conditions: If you are using joins, it may be that the same table is being joined multiple times without proper aliasing.
  View Definition Issues: The view definition may not be correctly structured, leading to ambiguity in the selection criteria.
  
  Solution:
  
  Check the View Definition: Review the definition of the view or database object that is causing the error. Ensure that each table is only referenced once in the selection criteria.
  Use Aliases: If you need to reference the same table multiple times, consider using table aliases to differentiate between the instances. This allows you to join the same table in different contexts.
  Modify the Selection Criteria: If the same table is not needed multiple times, remove the duplicate references from the selection criteria.
  Recreate the View: If the view is complex, it may be easier to recreate it from scratch, ensuring that you do not include the same table more than once.
  
  Related Information:
  
  Transaction Codes: You can use transaction codes like SE11 (Data Dictionary) to view and modify the table/view definitions.
  Documentation: Refer to SAP documentation for guidelines on creating views and using joins effectively.
  SAP Notes: Check for any relevant SAP Notes that might address specific issues related to this error message or provide additional context.
  
  If you continue to experience issues after following these steps, consider reaching out to your SAP Basis or ABAP team for further assistance, as they may have more insights into the specific configurations and customizations in your SAP environment.