How To Fix DT646 - Buffering not permitted for &, but a buffering type was defined

SAP Error Message - Details

• Message type: E = Error

• Message class: DT - Table activation (incl. indexes)

• Message number: 646

• Message text: Buffering not permitted for &, but a buffering type was defined

What causes this issue?

The technical settings of the table specify that the table should not
be buffered. A buffering type was entered for the table nevertheless.

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?

Correct the technical settings of the table. You may only specify a
buffering type if the table may be buffered. This is the case if one of
the options 'Buffering switched on' or 'Buffering allowed but
switched off' is selected.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message DT646 - Buffering not permitted for &, but a buffering type was defined ?

  The SAP error message DT646 indicates that there is an issue with the buffering settings for a particular database table. Specifically, it means that buffering is not permitted for the specified table, but a buffering type has been defined in the table's technical settings. This can lead to inconsistencies or unexpected behavior in the application.
  Cause:
  
  
  Buffering Configuration: The table in question has been configured to use buffering, but the underlying database or the table's definition does not support it. This can happen if:
  
  The table is defined as a pooled or cluster table.
  The table has certain characteristics (like being a transparent table with specific keys) that do not allow buffering.
  The table is used in a way that does not support buffering (e.g., it is frequently updated).
  
  
  
  Technical Settings: The technical settings of the table may have been incorrectly configured, leading to a mismatch between the buffering type defined and the actual capabilities of the table.
  
  
  Solution:
  
  
  Check Table Definition: Review the technical settings of the table in transaction SE11 (Data Dictionary). Ensure that the buffering settings are appropriate for the type of table you are working with. If the table is not suitable for buffering, you may need to change the buffering type to "No Buffering."
  
  
  Adjust Buffering Settings:
  
  If the table should not be buffered, change the buffering type to "No Buffering" in the technical settings.
  If the table should be buffered, ensure that it is a transparent table and meets the requirements for buffering.
  
  
  
  Transport Changes: If changes are made to the table's buffering settings, ensure that these changes are transported to the relevant systems (e.g., development to production) to maintain consistency.
  
  
  Consult Documentation: Refer to SAP documentation or notes related to buffering and the specific table to understand any limitations or requirements.
  
  
  Related Information:
  
  Transaction SE11: Use this transaction to view and modify the technical settings of database tables.
  SAP Notes: Check for any relevant SAP Notes that may provide additional insights or solutions related to this error message.
  Performance Considerations: Understand the implications of buffering on performance, especially for tables that are frequently accessed or updated.
  
  By addressing the buffering configuration and ensuring it aligns with the table's capabilities, you should be able to resolve the DT646 error message.