How To Fix WL860 - The callback function module must be set for work items of type E

WL860 - Overview

• Message type: E = Error

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

• Message number: 860

• Message text: The callback function module must be set for work items of type E

What causes this issue?

When a wait step work item (type E) was created, the parameter for the
callback function module for the callback to the workflow manager (WFM)
was not set. However, this parameter is mandatory for work items of
this type as opposed to all other work item types.

System Response

Creation of the work item was terminated.

How to fix this error?

When you create a wait step work item, always specify a callback
function module. Make sure this corresponds to the required interface.
As an example, consider the interface of the function module
SWP_CALLBACK_WI_DONE.

Error message extract from SAP system. Copyright SAP SE.

WL860 - Details

• The SAP error message WL860 indicates that a callback function module must be set for work items of type E (which typically refers to "Event" work items). This error usually occurs in the context of SAP Business Workflow when the system is trying to process a work item that requires a specific function module to handle it, but that function module has not been defined.
  
  Cause:
  
  Missing Callback Function Module: The most common cause of this error is that the workflow definition does not have a callback function module assigned for the specific work item type.
  Incorrect Configuration: The workflow might be incorrectly configured, leading to the absence of necessary function modules.
  Custom Development: If there are custom workflows or modifications, the required function module may not have been implemented or registered correctly.
  
  
  Solution:
  To resolve the WL860 error, you can follow these steps:
  
  
  Check Workflow Definition:
  
  Go to transaction code SWDD (Workflow Builder).
  Open the workflow definition that