How To Fix AQ589 - Pay attention to the join type change.

SAP Error Message - Details

• Message type: E = Error

• Message class: AQ - Message texts for SAP Query

• Message number: 589

• Message text: Pay attention to the join type change.

What causes this issue?

Changing the hierarchy of the tables forced the join conditions to
be adjusted.

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

System Response

Some join conditions were converted from left outer join to inner join
or from inner join to left outer join. The remaining join conditions
are now consistent.

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 AQ589 - Pay attention to the join type change. ?

  The SAP error message AQ589, which states "Pay attention to the join type change," typically occurs in the context of SAP BW (Business Warehouse) or SAP HANA when there is a change in the join type of a query or data model. This message is a warning indicating that the join type has been altered, which can affect the results of your query or data extraction.
  Cause:
  
  Change in Data Model: The join type in a query or data model may have been changed from an inner join to an outer join (or vice versa), which can lead to different results.
  Data Source Modification: If the underlying data source or InfoProvider has been modified, it may affect how data is joined and retrieved.
  Query Redesign: Changes made to the query design, such as adding or removing fields, can also trigger this warning.
  Performance Considerations: Sometimes, changes in join types are made to optimize performance, but they can lead to unexpected results if not properly managed.
  
  Solution:
  
  Review the Query: Check the query definition to understand the current join types being used. Ensure that the join types align with your data retrieval requirements.
  Test the Query: Execute the query to see if the results are as expected. Compare the results with previous executions to identify any discrepancies.
  Consult Documentation: Refer to SAP documentation or help resources to understand the implications of the join type changes.
  Adjust Data Model: If necessary, revert the join type to its original state or adjust the data model to ensure that it meets your reporting needs.
  Communicate Changes: If the change was intentional, communicate with relevant stakeholders to ensure they are aware of the implications of the join type change.
  
  Related Information:
  
  Join Types: Understand the different types of joins (inner, outer, left, right) and how they affect data retrieval.
  SAP BW Documentation: Review SAP BW documentation for best practices on query design and data modeling.
  Performance Tuning: If performance is a concern, consider optimizing the data model or query without compromising the accuracy of the results.
  SAP Community: Engage with the SAP Community or forums for insights from other users who may have encountered similar issues.
  
  By addressing the cause of the error and implementing the suggested solutions, you can mitigate the impact of the join type change and ensure that your queries return accurate and expected results.