How To Fix UPF086 - Variable &1 must have the type of a field to be changed

SAP Error Message - Details

• Message type: E = Error

• Message class: UPF - Planning Functions

• Message number: 086

• Message text: Variable &1 must have the type of a field to be changed

What causes this issue?

The formula contains a variable declaration in which an invalid type is
used. Only those characteristics are allowed as types which are
contained in the list of fields to be changed of the formula function.

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?

Change the type of the variable to that of a field to be changed. You
can find out which characteristics are possible here from the
presentation in the formula operand: All fields to be changed are
contained in the formula operands

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 UPF086 - Variable &1 must have the type of a field to be changed ?

  The SAP error message UPF086 indicates that a variable in your ABAP program or report is being used in a context where it is expected to be a field that can be changed, but it is not defined as such. This typically occurs when you are trying to modify a variable that is not declared as a field or is not of a compatible type.
  Cause:
  
  Variable Declaration: The variable in question is declared in a way that does not allow it to be changed. For example, it might be declared as a constant or as a type that does not support modification.
  Data Type Mismatch: The variable may be of a type that is not compatible with the operation you are trying to perform. For instance, if you are trying to assign a value to a variable that is not a field or is a read-only type.
  Context of Use: The variable is being used in a context (like a loop or a function) where it is expected to be a field that can be modified, but it is not.
  
  Solution:
  
  Check Variable Declaration: Ensure that the variable is declared correctly. If it needs to be changed, it should be declared as a data type that allows modification (e.g., a standard data type or a reference to a field).
  DATA: lv_variable TYPE your_data_type.
  
  Change Data Type: If the variable is declared as a constant or a type that does not allow changes, consider changing its declaration to a mutable type.
  Review Context: Look at where and how the variable is being used. Ensure that it is being used in a context that allows for modification. For example, if you are trying to modify a field in a structure, ensure that the structure is defined correctly and that you are referencing the field properly.
  Use Field Symbols: If you need to work with dynamic fields, consider using field symbols or references that can point to fields that can be modified.
  FIELD-SYMBOLS: <fs_variable> TYPE any.
  ASSIGN your_field TO <fs_variable>.
  
  
  Related Information:
  
  ABAP Documentation: Refer to the official SAP ABAP documentation for more details on variable declarations and data types.
  Debugging: Use the ABAP debugger to step through your code and inspect the variable types and values at runtime to identify where the issue arises.
  SAP Community: Engage with the SAP Community forums for additional insights and solutions from other developers who may have encountered similar issues.
  
  By following these steps, you should be able to resolve the UPF086 error and ensure that your variable is correctly defined and used in your ABAP program.