How To Fix WD457 - Requested operation is only allowed on the start node of a block

WD457 - Overview

• Message type: E = Error

• Message class: WD - Workflow definition

• Message number: 457

• Message text: Requested operation is only allowed on the start node of a block

Self-Explanatory Message

Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of messages in the SAP system have a message text, however this is frequently insufficient to comprehend or resolve the problem.

To make things easier, more detailed information is frequently added to describe the issue, how to fix it, and the necessary steps or configuration modifications.

Unfortunately, there isn't any extra information in this error notice.

What else can you do?

First, use our AnswerBot below to get a possible cause and solution (requires a premium subscription).

Also, review the in-depth Common Questions & Answers listed below; you could discover a solution there or be able to connect with others who have faced similar challenges.

You can also try searching the SAP support portal (support.sap.com) but you need a special user ID to access it. It is possible that an SAP support note exists that provides additional details about the mistake or even steps for fixing it.

Smart SAP Assistant

• What is the cause and solution for SAP error message WD457 - Requested operation is only allowed on the start node of a block ?

  Certainly! Here's a detailed explanation of the SAP error message:
  
  SAP Error Message:
  WD457 - Requested operation is only allowed on the start node of a block
  
  
  Cause:
  This error occurs in the Web Dynpro ABAP environment when an operation that is only valid on the start node of a UI element block is attempted on a different node (e.g., a child node or a node that is not the start node).
  In Web Dynpro, UI elements like blocks (containers for UI elements) have a hierarchical structure. Certain operations, such as setting focus, enabling/disabling, or manipulating the block, are only allowed on the start node of that block. If your code tries to perform such an operation on a node that is not the start node, the system raises this error.
  
  Typical Scenarios:
  
  Trying to set the focus on a node that is not the start node of a block.
  Attempting to enable/disable or make visible/invisible a node