How To Fix WD292 - No further operations may take place while appending a table

SAP Error Message - Details

• Message type: E = Error

• Message class: WD - Workflow definition

• Message number: 292

• Message text: No further operations may take place while appending a table

What causes this issue?

You have executed an additional operation while appending an element.

How can this happen?

The following container operation is not possible:
<Multi-line Element1> <- <Element1> + <Element2>

System Response

No further operations may take place while appending.

How to fix this error?

To implement the required operation, an additional container operation
must be defined. This is inserted in the Workflow definition before the
container operation in which the appending takes place.
&Example&
1. Container operation: <Element1> = <Element1> + <Element2>
2. Container operation: <Multi-lineElement1> <- <Element1>

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message WD292 - No further operations may take place while appending a table ?

  SAP Error Message:
  
  WD292 No further operations may take place while appending a table
  
  Cause
  This error occurs in Web Dynpro ABAP when you try to perform operations on an internal table (such as appending rows) while the table is currently being processed or iterated over in a way that does not allow modification. Specifically, the error is raised if you attempt to append data to an internal table during a loop or operation that locks the table for reading or processing, such as during a LOOP AT or when the table is being used in a context that forbids changes (e.g., inside a READ TABLE with a WITH KEY or during a table control rendering).
  In Web Dynpro, this often happens when you try to modify the context node's internal table (e.g., appending rows) while the framework is still processing the table for UI rendering or event handling.
  
  Explanation
  
  The internal table is locked for reading or processing.
  Modifications like appending rows are not allowed during this locked state.
  This is a safeguard to prevent inconsistent data states or runtime errors.
  
  
  Solution
  
  
  Avoid modifying the internal table during iteration or processing:
  
  Do not append or modify the internal table inside a LOOP AT or while the table is being processed.
  Instead, collect the new rows in a separate temporary internal table and append them after the loop or processing is finished.
  
  
  
  Use a temporary internal table:
  DATA: lt_temp TYPE your_table_type.
  
  LOOP AT your_table INTO DATA(ls_row).
    " Process rows, decide if new rows are needed
    " Append new rows to lt_temp, not your_table
  ENDLOOP.
  
  " After loop, append all new rows at once
  APPEND LINES OF lt_temp TO your_table.
  
  
  Modify the context node data outside of event handlers or UI rendering phases:
  
  If you are modifying context nodes, do it in appropriate event handlers (e.g., action handlers) and not during UI rendering or data binding phases.
  
  
  
  Check for nested calls or recursive modifications:
  
  Sometimes, the error occurs if the modification triggers another event that tries to modify the table again.
  Use flags or logic to prevent recursive modifications.
  
  
  
  
  Related Information
  
  This error is specific to Web Dynpro ABAP applications.
  It is related to the internal locking mechanism of tables during UI rendering or event processing.
  Similar errors can occur in other SAP UI technologies when modifying collections during iteration.
  SAP Notes and forums often suggest using temporary tables or deferring modifications until after processing.
  
  
  Summary
  
  
  
  Aspect
  Description
  
  
  
  
  Cause
  Attempting to append to an internal table while it is locked for processing or iteration.
  
  
  Solution
  Use a temporary table to collect new rows and append after processing; avoid modifying during loops or UI rendering.
  
  
  Related
  Web Dynpro ABAP context node modifications, internal table locking during UI rendering.
  
  
  
  
  If you provide the code snippet or context where the error occurs, I can help you with a more specific fix.