How To Fix SY406 - Table changes not possible with format &

SY406 - Overview

• Message type: E = Error

• Message class: SY - ABAP/4 system messages

• Message number: 406

• Message text: Table changes not possible with format &

What causes this issue?

You entered "&V1&" as the display format.
However, you cannot change a displayed internal table when this format
is set.
You can only change tables with standard formatting.

System Response

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

How to fix this error?

To change the table contents, overwrite the current format with a
space. If the table lines are structures, the format is automatically
set to "E" (column display with formatting).

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message SY406 - Table changes not possible with format & ?

  The SAP error message SY406, which states "Table changes not possible with format &," typically occurs when there is an attempt to modify a database table that is not allowed due to its format or structure. This error can arise in various scenarios, such as when trying to update a table that is defined as a view, a table that is part of a transport request, or a table that is locked for changes.
  Causes:
  
  Table Format: The table you are trying to modify may be defined in a way that does not allow changes (e.g., it could be a view or a table with a specific format).
  Transport Request: The table might be part of a transport request that is currently locked or not released for changes.
  Database Lock: The table could be locked by another user or process, preventing any modifications.
  Authorization Issues: The user may not have the necessary authorizations to make