How To Fix AQ639 - More than 16 tables cannot be processed here

AQ639 - Overview

• Message type: E = Error

• Message class: AQ - Message texts for SAP Query

• Message number: 639

• Message text: More than 16 tables cannot be processed here

What causes this issue?

You attempted to bring in more than 16 tables into the join definition.
This is currently 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?

Check whether the combination of this data is not available in fewer
tables.
Take into account the possibility of database views or logical
databases.
Consider, where necessary, the creation of a database view for the
combination of several tables and use of this view in the ABAB Join.

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 AQ639 - More than 16 tables cannot be processed here ?

  The SAP error message AQ639 ("More than 16 tables cannot be processed here") typically occurs when you are trying to perform an operation that involves more than 16 database tables in a single SQL statement or operation. This limitation is often encountered in scenarios involving joins, subqueries, or when using certain SAP functions that have a restriction on the number of tables that can be processed simultaneously.
  
  Cause:
  
  SQL Statement Limitation: The error arises because the SQL statement or operation you are trying to execute involves more than 16 tables. This is a limitation in the database or the way SAP handles SQL operations.
  Complex Queries: If you are executing a complex query that joins multiple tables, it may exceed the limit.
  Function Module or Report: Certain function modules or reports may have internal limitations on the number of tables they can handle.
  
  
  Solution:
  
  Simplify the Query: Try to break down the query into smaller parts.