How To Fix WL406 - Maximum nesting level reached

SAP Error Message - Details

• Message type: E = Error

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

• Message number: 406

• Message text: Maximum nesting level reached

What causes this issue?

In an attempt to start a subworkflow step, the maximum permitted
nesting depth has been exceeded.

System Response

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

INCLUDE NA_WF_ERROR OBJECT DOKU ID TX

How to fix this error?

The maximum eligible nesting depth for subworkflow calls serves as a
simple mechanism to discover unintentionl recursions ("endless loops").
The value can be set in the workflow administration.
Check the workflow execution: If you actually require more than the
currently set nesting depth, then contact your workflow system
administrator and have the value increased to an appropriate upper
limit. Then continue the stopped workflow execution.
If the workflow execution runs in an unintentional endless loop or
recursion, then you must check why this occurred and correct the
relevant workflow definition(s). Attention: A recursion can possibly
involve several workflow definitions (indirect recursive workflows).

Procedure for System Administrators

You can change the upper limit in <LS>Customizing workflow runtime</>
(transaction <AB>SWPA</>) in the basic settings of the workflow
runtime.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message WL406 - Maximum nesting level reached ?

  The SAP error message WL406 "Maximum nesting level reached" typically occurs in the context of workflow processing. This error indicates that the workflow has exceeded the maximum allowed nesting level for workflow calls or activities. This can happen when a workflow calls itself recursively or when there are too many nested workflow calls.
  Causes:
  
  Recursive Workflow Calls: A workflow may be designed to call itself directly or indirectly, leading to infinite recursion.
  Excessive Nested Calls: Workflows that call other workflows or activities in a deeply nested manner can exceed the maximum nesting limit.
  Configuration Issues: Incorrect configuration of workflow settings or parameters may lead to unintended recursive behavior.
  
  Solutions:
  
  Review Workflow Design: Check the workflow design for any recursive calls. Ensure that workflows do not call themselves directly or indirectly without a proper exit condition.
  Limit Nesting: If your workflow design requires multiple nested calls, consider flattening the workflow structure or breaking it into smaller, more manageable workflows.
  Adjust Workflow Parameters: If applicable, review and adjust the parameters related to workflow execution limits in the SAP system configuration. However, this should be done with caution and typically as a last resort.
  Debugging: Use the workflow log and debugging tools to trace the execution path of the workflow. This can help identify where the excessive nesting is occurring.
  Consult Documentation: Refer to SAP documentation for specific limits and best practices regarding workflow design and nesting levels.
  
  Related Information:
  
  SAP Notes: Check for any relevant SAP Notes that may address this specific error or provide guidance on best practices for workflow design.
  Workflow Monitoring: Utilize SAP's workflow monitoring tools to analyze workflow instances and identify problematic areas.
  Performance Considerations: Be aware that excessive nesting can lead to performance issues, so optimizing workflow design is crucial for system efficiency.
  
  If the problem persists after trying the above solutions, it may be beneficial to consult with SAP support or a technical consultant who specializes in SAP workflows.