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

WD292 - Overview

• 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.

WD292 - Details

• 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