How To Fix UPF088 - Formula error: Variable name &1 is not allowed

UPF088 - Overview

• Message type: E = Error

• Message class: UPF - Planning Functions

• Message number: 088

• Message text: Formula error: Variable name &1 is not allowed

What causes this issue?

Variable name '&V1&' has a format which is not allowed. Variable names
must fulfil the following requirements:
The name must begin with a letter, and it can only contain letters,
digits, and an underscore.
The name cannot be identical to a keyword or to the name of an
installed function.
The name cannot be longer than 20 letters.

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?

Alter the variable name so that it corresponds to the requirements
mentioned above.

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.

UPF088 - Details

• The SAP error message UPF088, which states "Formula error: Variable name &1 is not allowed," typically occurs in the context of SAP's Universal Allocation or similar functionalities where formulas are used to define calculations or allocations. This error indicates that there is an issue with the variable name used in a formula, which is not recognized or is invalid.
  
  Cause:
  
  Invalid Variable Name: The variable name specified in the formula may not be defined or is not allowed in the context of the formula.
  Typographical Error: There might be a typo in the variable name, leading to it being unrecognized.
  Scope Issues: The variable may not be available in the scope where the formula is being executed.
  
  Configuration Issues: The system may not be properly configured to recognize certain variables, especially if they are custom or user-defined.
  
  
  Solution:
  
  Check Variable Name: Verify that the variable name used in the formula is correct and matches the expected naming