How To Fix AD257 - Gen. buffering not allowed. Table & contains only one key field

AD257 - Overview

• Message type: E = Error

• Message class: AD - Data Dictionary application messages

• Message number: 257

• Message text: Gen. buffering not allowed. Table & contains only one key field

What causes this issue?

The table whose <LS>Technical settings</> you are maintaining
has only one key field. Since generic buffering calls for a number
of key fields lying between 1 and (key field number - 1), no generic
buffering is possible in this case.

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?

Choose a different buffering type. Generic buffering is possible
only for tables with more than one key field.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message AD257 - Gen. buffering not allowed. Table & contains only one key field ?

  The SAP error message AD257 ("Gen. buffering not allowed. Table & contains only one key field") typically occurs when you attempt to enable buffering for a database table that does not meet the necessary criteria for buffering. In SAP, buffering is a performance optimization technique that allows frequently accessed data to be stored in memory, reducing the need for database access.
  
  Cause:
  The error arises because:
  
  The table in question has only one key field. SAP requires that tables with buffering enabled must have a primary key consisting of at least two fields or a unique key that allows for efficient data retrieval.
  The table may be defined in a way that does not support buffering due to its structure or intended use.
  
  
  Solution:
  To resolve this error, you can consider the following options:
  
  
  Check Table Structure: Review the structure of the table to confirm that it indeed has only one key field. If it is a