How To Fix FKKBIX021 - Maximum number of tables reached

SAP Error Message - Details

• Message type: E = Error

• Message class: FKKBIX - Conv.Inv.: Billing (Invoice Preprocessing)

• Message number: 021

• Message text: Maximum number of tables reached

What causes this issue?

The maximum number of tables was reached. You cannot add any more
tables.

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?

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message FKKBIX021 - Maximum number of tables reached ?

  The SAP error message FKKBIX021, which states "Maximum number of tables reached," typically occurs in the context of the SAP system's ability to handle a certain number of database tables in a single operation or transaction. This error is often encountered when working with the SAP Financial Accounting (FI) module, particularly during processes that involve a large number of line items or when generating reports that require data from multiple tables.
  Cause:
  
  Limit on Table Joins: SAP has a limit on the number of tables that can be joined in a single query or operation. When this limit is exceeded, the FKKBIX021 error is triggered.
  Complex Queries: If a query or report is designed to pull data from too many tables, it can exceed the system's capacity to process them in one go.
  Large Data Volume: Operations involving large volumes of data can also lead to this error, especially if they require extensive joins across multiple tables.
  
  Solution:
  
  
  Optimize Queries: Review and optimize the queries or reports that are causing the error. Try to reduce the number of tables being joined by:
  
  Simplifying the query.
  Breaking it down into smaller, more manageable parts.
  Using temporary tables or views to aggregate data before performing joins.
  
  
  
  Use Selection Criteria: Apply more specific selection criteria to limit the amount of data being processed at one time. This can help reduce the number of tables involved in the operation.
  
  
  Check Custom Code: If there are custom ABAP programs or reports that are causing the issue, review the code for efficiency and consider refactoring it to reduce the number of table accesses.
  
  
  Increase System Resources: In some cases, increasing the system resources (like memory) may help, but this is more of a workaround than a solution to the underlying problem.
  
  
  Consult SAP Notes: Check the SAP Support Portal for any relevant SAP Notes or patches that may address this issue. There may be specific recommendations or fixes provided by SAP.
  
  
  Engage SAP Support: If the problem persists and cannot be resolved through the above methods, consider reaching out to SAP Support for assistance. They may provide insights specific to your system configuration or version.
  
  
  Related Information:
  
  SAP Documentation: Review the official SAP documentation for the specific module you are working with, as it may provide additional context or guidelines for handling large data sets.
  Performance Tuning: Consider general performance tuning practices for SAP systems, which can help mitigate issues related to data processing limits.
  Database Configuration: Sometimes, database configuration settings can impact how queries are processed. Consult with your database administrator to ensure optimal settings.
  
  By addressing the root causes and optimizing your queries, you should be able to resolve the FKKBIX021 error effectively.