How To Fix AD259 - This number of key fields is not permitted with generic buffering

SAP Error Message - Details

• Message type: E = Error

• Message class: AD - Data Dictionary application messages

• Message number: 259

• Message text: This number of key fields is not permitted with generic buffering

What causes this issue?

You want to buffer a table generically, but specified an incorrect
number of key fields. For generic buffering, you must specify a number
of key fields between 1 and n-1, where n is the number of key fields
in the table. If the table has only one key field, generic buffering is
not possible.

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?

You can find out the possible number of key fields using the input help
in the corresponding entry field. Select one of the numbers given there.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message AD259 - This number of key fields is not permitted with generic buffering ?

  The SAP error message AD259, which states "This number of key fields is not permitted with generic buffering," typically occurs when there is an attempt to use generic buffering on a database table that has an inappropriate number of key fields defined for that buffering type.
  Cause:
  
  Key Field Limitation: Generic buffering in SAP allows for the buffering of data based on a limited number of key fields. If a table has more key fields than the allowed limit for generic buffering, this error will be triggered.
  Buffering Configuration: The table may be configured for generic buffering, but the number of key fields exceeds the permissible limit set by SAP.
  
  Solution:
  
  Check Table Definition: Review the definition of the table in question. You can do this using transaction SE11 (Data Dictionary). Look at the number of key fields defined for the table.
  Adjust Buffering Settings: If the table has too many key fields for generic buffering, consider changing the buffering type:
  
  Switch to Full Buffering: If appropriate, you can switch the buffering type to full buffering, which allows for all records to be buffered regardless of the number of key fields.
  Disable Buffering: If buffering is not necessary for the table, you can disable it altogether.
  
  
  Modify Key Fields: If feasible, consider redesigning the table to reduce the number of key fields, although this may not always be practical or possible.
  Consult SAP Notes: Check for any relevant SAP Notes that may provide additional guidance or updates related to this error.
  
  Related Information:
  
  
  Buffering Types: SAP supports different types of buffering:
  
  Generic Buffering: Buffers data based on a limited number of key fields.
  Full Buffering: Buffers all records of the table.
  No Buffering: No records are buffered.
  
  
  
  Transaction Codes:
  
  SE11: Data Dictionary to view and modify table definitions.
  SE14: Database Utility to manage database objects, including buffering settings.
  
  
  
  Performance Considerations: Buffering can significantly improve performance for read-heavy tables, but it should be configured correctly to avoid issues like the AD259 error.
  
  
  If you continue to experience issues or if the solution is not clear, it may be beneficial to consult with your SAP Basis team or reach out to SAP support for further assistance.