How To Fix AD529 - Buffering not allowed.(-> No. of fields in gen. key must be 0)

SAP Error Message - Details

• Message type: E = Error

• Message class: AD - Data Dictionary application messages

• Message number: 529

• Message text: Buffering not allowed.(-> No. of fields in gen. key must be 0)

What causes this issue?

Buffering of this table is not allowed. Despite this fact, a key field
number not equal to 0 is entered in the technical settings for the
table. A key field number should only be entered if a table is to be
buffered generically.

System Response

An error message is output.

How to fix this error?

Set the key field number in the technical settings to 0.
To do this, select the option <LS>Technical settings</> in the
<LS>Goto</> menu of the table maintenance function. In the next screen,
press the pushbutton <LS>Chnge key fld no.</> and delete the key field
number entry in the displayed dialog box. Then, activate the technical
settings.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message AD529 - Buffering not allowed.(-> No. of fields in gen. key must be 0) ?

  The SAP error message AD529 ("Buffering not allowed. (-> No. of fields in gen. key must be 0)") typically occurs when there is an attempt to buffer a database table that has a general key (i.e., a key that consists of fields other than the primary key) defined. 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:
  
  General Key Definition: The table in question has a general key defined, which means it has fields that are not part of the primary key. SAP does not allow buffering for tables with general keys because it can lead to inconsistencies in data.
  Table Configuration: The configuration of the table in the Data Dictionary (SE11) may have been set to allow buffering, but the presence of a general key prevents this.
  
  Solution:
  
  Check Table Definition: Go to transaction SE11 and check the definition of the table that is causing the error. Look for any fields that are part of a general key.
  Remove General Key: If possible, consider removing the general key from the table definition. This may involve redesigning how the data is accessed or stored.
  Disable Buffering: If the general key cannot be removed, you can disable buffering for the table. This can be done in the table definition in SE11 by setting the buffering option to "No buffering."
  Consult Documentation: Review SAP documentation or consult with your SAP Basis team for best practices regarding table buffering and key definitions.
  
  Related Information:
  
  Buffering Types: SAP supports different types of buffering (single record, full table, etc.), and the choice of buffering type can impact performance.
  Performance Considerations: While buffering can improve performance, it is essential to ensure data consistency, especially in environments with high transaction volumes.
  SAP Notes: Check for any relevant SAP Notes that may provide additional insights or updates regarding this error message.
  
  Additional Steps:
  
  Testing: After making changes to the table definition, test the application to ensure that the error is resolved and that performance is acceptable.
  Documentation: Document any changes made to the table structure or buffering settings for future reference and compliance.
  
  If you continue to experience issues or if the changes are complex, consider reaching out to SAP support or a qualified SAP consultant for assistance.