How To Fix SWDP_WB_TOOL229 - Recursion node and node to be repeated cannot be identical

SAP Error Message - Details

• Message type: E = Error

• Message class: SWDP_WB_TOOL - Web Dynpro: Messages for Workbench Tools

• Message number: 229

• Message text: Recursion node and node to be repeated cannot be identical

What causes this issue?

A recursion node is only defined in a valid way if a node that is
recurrent is assigned to it. This node must be on the path from the root
node to the recursion node - that is, it must be its direct or indirect
predecessor.
Recursion nodes and recurrent nodes cannot be together.

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

System Response

How to fix this error?

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message SWDP_WB_TOOL229 - Recursion node and node to be repeated cannot be identical ?

  The SAP error message SWDP_WB_TOOL229 indicates that there is a problem with the configuration of a Web Dynpro application, specifically related to the use of recursion in the node definitions of the data model. This error occurs when a node is set to be recursive, but the node that is supposed to be repeated is the same as the recursion node, which is not allowed.
  Cause:
  The error arises from the following conditions:
  
  Recursion Definition: In a Web Dynpro application, a node can be defined to be recursive, meaning it can reference itself in a hierarchical structure.
  Node Configuration: If the node that is defined to be recursive is also set as the node to be repeated (i.e., the node that is used to display multiple instances of itself), it creates a conflict. The system cannot process this configuration because it leads to an infinite loop or ambiguity in the data structure.
  
  Solution:
  To resolve this error, you need to adjust the configuration of your Web Dynpro component. Here are the steps you can take:
  
  
  Check Node Definitions:
  
  Open the Web Dynpro component in the Web Dynpro Workbench.
  Navigate to the data model and locate the node that is causing the issue.
  
  
  
  Modify Recursion Settings:
  
  Ensure that the recursion node is not the same as the node that is set to be repeated.
  If you need to use recursion, create a separate node for the repeated instances that references the recursive node appropriately.
  
  
  
  Adjust Hierarchical Structure:
  
  If your application logic requires displaying hierarchical data, consider restructuring your nodes to avoid direct recursion in the same node.
  You may need to create additional nodes to represent different levels of the hierarchy.
  
  
  
  Test Changes:
  
  After making the necessary adjustments, activate and test the Web Dynpro application to ensure that the error is resolved and that the application behaves as expected.
  
  
  
  Related Information:
  
  Web Dynpro Documentation: Refer to the official SAP documentation for Web Dynpro to understand the concepts of nodes, data binding, and recursion in more detail.
  Debugging Tools: Use the debugging tools available in the SAP environment to trace the data flow and identify where the configuration might be going wrong.
  SAP Community: Engage with the SAP Community forums for additional insights and solutions from other developers who may have encountered similar issues.
  
  By following these steps, you should be able to resolve the SWDP_WB_TOOL229 error and ensure that your Web Dynpro application functions correctly.