How To Fix FDT_EXPRESSIONS180 - Column &1 (ID: &2) is already used as a column in the decision table

SAP Error Message - Details

• Message type: E = Error

• Message class: FDT_EXPRESSIONS - Formula & Derivation Tool: Expressions

• Message number: 180

• Message text: Column &1 (ID: &2) is already used as a column in the decision table

What causes this issue?

You have tried to assign object &v1& to a column of the current decision
table. However, this object is already assigned to another column in the
same table. Duplicate column assignments are not allowed in a decision
table.
Note: For this check, the system makes no difference between the types
of columns. Therefore, assigning the same object to a condition column
and a result column is also not allowed.

System Response

The object assignment to the column has been canceled.

How to fix this error?

Choose a different object to be assigned to the column, or remove the
already existing assignment before you repeat the action.

Procedure for System Administrators

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message FDT_EXPRESSIONS180 - Column &1 (ID: &2) is already used as a column in the decision table ?

  The SAP error message FDT_EXPRESSIONS180 indicates that there is a conflict in a decision table where a column is being reused or duplicated. Specifically, the error message states that a column (identified by its name and ID) is already being used as a column in the decision table, which is not allowed.
  Cause:
  The primary cause of this error is that the same column is defined multiple times within the same decision table. This can happen due to:
  
  Accidental duplication of column definitions.
  Incorrect configuration or design of the decision table.
  Importing or copying configurations that lead to duplicate columns.
  
  Solution:
  To resolve this error, you can follow these steps:
  
  
  Review the Decision Table: Open the decision table in the SAP system and carefully review the column definitions. Look for any duplicate entries for the column mentioned in the error message.
  
  
  Remove Duplicates: If you find that the same column is defined more than once, remove the duplicate entry. Ensure that each column in the decision table has a unique identifier.
  
  
  Check Dependencies: If the column is being referenced in other parts of the decision table or related configurations, ensure that removing the duplicate does not affect the logic or dependencies.
  
  
  Save and Test: After making the necessary changes, save the decision table and test it to ensure that the error is resolved and that the decision table functions as expected.
  
  
  Documentation: If applicable, document the changes made to avoid similar issues in the future.
  
  
  Related Information:
  
  Decision Tables: Decision tables are used in SAP to define business rules in a structured format. Each column typically represents a condition or action, and each row represents a rule.
  SAP FDT (Flexible Decision Table): The Flexible Decision Table framework allows users to create and manage decision tables more effectively. Understanding how to use this framework can help prevent such errors.
  Error Handling: Familiarize yourself with common error messages in SAP FDT to better troubleshoot issues in the future.
  
  If the problem persists after following these steps, consider reaching out to your SAP support team or consulting the SAP community for further assistance.