How To Fix FDT_EXPRESSIONS778 - Redundant value assignment to data object &3 (position &1)

SAP Error Message - Details

• Message type: E = Error

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

• Message number: 778

• Message text: Redundant value assignment to data object &3 (position &1)

What causes this issue?

In the current rule, you have defined an operation at position &v1&
where the result of expression &v2& is assigned to data object &v3&.
However, the system has detected that data object &v3& is already used
as the result data object of expression &v2&. Therefore, assigning the
expression result to this data object is redundant because after
processing the expression, data object &v3& already has the correct
value. Assigning the same value once again to the data object is not
needed, and it slows down performance.

System Response

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

How to fix this error?

We recommend you replace the value assignment at position &v1& by a
simple call of expression &v2&.

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message FDT_EXPRESSIONS778 - Redundant value assignment to data object &3 (position &1) ?

  The SAP error message FDT_EXPRESSIONS778 indicates that there is a redundant value assignment to a data object in your expression. This typically occurs in the context of using the SAP Fiori Design Time (FDT) or when working with expressions in SAP applications.
  Cause:
  The error arises when you attempt to assign a value to a data object that has already been assigned a value. This can happen in various scenarios, such as:
  
  You have multiple assignments to the same variable or data object within the same scope.
  The logic in your expression is structured in a way that leads to unnecessary or duplicate assignments.
  
  Solution:
  To resolve this error, you can take the following steps:
  
  
  Review the Expression Logic: Check the expression where the error occurs. Look for any redundant assignments to the same data object. Ensure that each data object is assigned a value only once within the same scope.
  
  
  Refactor the Code: If you find multiple assignments to the same data object, refactor your code to eliminate the redundancy. You may need to restructure your logic to ensure that each variable is assigned a value only when necessary.
  
  
  Use Conditional Assignments: If the assignment is conditional, ensure that the conditions are mutually exclusive or that the assignment only occurs when the data object is uninitialized or has a specific value.
  
  
  Debugging: If you are unsure where the redundancy is occurring, use debugging tools to step through the code and identify where the assignments are being made.
  
  
  Consult Documentation: If you are using specific functions or methods, refer to the SAP documentation for those functions to understand their behavior and ensure you are using them correctly.
  
  
  Related Information:
  
  SAP Fiori Design Time (FDT): This is a framework for developing and managing Fiori applications. Understanding how expressions work within this framework can help you avoid similar errors.
  Data Object Scope: Familiarize yourself with the scope of data objects in your application. Knowing where and how data objects are defined and used can help prevent redundancy.
  SAP Community: If you continue to face issues, consider reaching out to the SAP Community or forums where other developers may have encountered similar issues.
  
  By following these steps, you should be able to resolve the FDT_EXPRESSIONS778 error and improve the quality of your code.