How To Fix WL382 - Expression '&' for task: Error during evaluation or incorrect data type

SAP Error Message - Details

• Message type: E = Error

• Message class: WL - Workflow: run-time messages

• Message number: 382

• Message text: Expression '&' for task: Error during evaluation or incorrect data type

What causes this issue?

Expression '&V1&' should return a task for Workflow step no. &V4&.
However, the result does not have the correct data type or returns
errors during the evaluation:
Expression:,,'&V1&'
Value:,,,,'&V2&'
ABAP type:,,'&V3&'

System Response

The Workflow was stopped and given an error status.

How to fix this error?

Please correct the definition or implementation of the expression to
return a value with reference to the DDIC domain HROBJEC_14 (ABAP type:
C14) liefert. You should note that numbers alone may not be used
because they must be preceded by an org. object type "T ...", "WF...",
etc.
Multi-line elements and object references are also not possible at this
point.
A workflow which has been stopped can be continued by selecting the
function <LS>Restart after error</>.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message WL382 - Expression '&' for task: Error during evaluation or incorrect data type ?

  The SAP error message WL382, which states "Expression '&' for task: Error during evaluation or incorrect data type," typically occurs in the context of workflow or task evaluation in SAP systems. This error indicates that there is an issue with the expression being evaluated, which could be due to a variety of reasons, such as incorrect data types, syntax errors, or logical errors in the workflow definition.
  Causes of WL382 Error
  
  
  Incorrect Data Type: The expression may be trying to evaluate data types that are incompatible. For example, trying to perform arithmetic operations on string data types.
  
  
  Syntax Errors: There may be a syntax error in the expression itself, such as missing operators, parentheses, or incorrect function usage.
  
  
  Null or Undefined Values: The expression might be referencing variables or fields that are null or not defined, leading to evaluation errors.
  
  
  Logical Errors: The logic of the expression may not be valid for the context in which it is being used.
  
  
  Workflow Configuration Issues: There may be issues in the workflow configuration or the way tasks are defined, leading to evaluation problems.
  
  
  Solutions to WL382 Error
  
  
  Check Data Types: Ensure that all variables and fields used in the expression are of the correct data type. If necessary, convert data types to ensure compatibility.
  
  
  Review Expression Syntax: Carefully review the expression for any syntax errors. Ensure that all operators and functions are used correctly.
  
  
  Handle Null Values: Implement checks for null or undefined values in the expression to prevent evaluation errors. Use conditional statements to handle such cases.
  
  
  Debugging: Use debugging tools available in SAP to trace the execution of the workflow and identify where the error occurs. This can help pinpoint the exact cause of the issue.
  
  
  Consult Documentation: Refer to SAP documentation or help resources for guidance on the specific functions and expressions being used in the workflow.
  
  
  Test in Isolation: If possible, isolate the expression and test it independently to see if it evaluates correctly outside of the workflow context.
  
  
  Seek Help from SAP Community: If the issue persists, consider reaching out to the SAP community or support for assistance. Provide details about the expression and the context in which the error occurs.
  
  
  Related Information
  
  SAP Workflow Documentation: Review the official SAP documentation related to workflows and expressions for best practices and examples.
  SAP Notes: Check for any relevant SAP Notes that may address known issues or provide patches related to this error.
  Transaction Codes: Familiarize yourself with transaction codes related to workflow management, such as SWDD (Workflow Builder) and SWI1 (Work Item Selection).
  
  By following these steps, you should be able to identify and resolve the cause of the WL382 error in your SAP system.