How To Fix WL021 - No implementation found for log '&'

WL021 - Overview

• Message type: E = Error

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

• Message number: 021

• Message text: No implementation found for log '&'

What causes this issue?

Various protocols can be chosen for sending data in the Web activity.
However, no implementing class could be found for the protocol
currently chosen (number: &V1&).

System Response

The workflow system does not send any data.

How to fix this error?

Enter an appropriate implementation for the protocol.

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 WL021 - No implementation found for log '&' ?

  Certainly! Here's a detailed explanation for the SAP error message:
  
  SAP Error Message:
  WL021 No implementation found for log '&'
  
  
  Cause:
  This error occurs when the SAP system tries to process a workflow log entry but cannot find the corresponding implementation (class or function module) that handles the log type specified by the placeholder '&' (which will be replaced by the actual log type in the real message).
  In other words, the workflow runtime is attempting to write or process a workflow log entry of a certain type, but the system does not have an implementation registered or available to handle that log type.
  Common reasons include:
  
  Missing or incomplete workflow component implementations.
  Custom workflow log types introduced but not properly implemented.
  Incomplete transport or system upgrade where some workflow classes or function modules are missing.
  Corrupted or inconsistent workflow repository.
  
  
  
  Solution:
  
  
  Check the Log Type:
  Identify the actual log type that replaces the '&' in the error message. This will give you