How To Fix LRM_BS007 - Join definition with same table on the left and the right

SAP Error Message - Details

• Message type: E = Error

• Message class: LRM_BS - IRM - Business Suite

• Message number: 007

• Message text: Join definition with same table on the left and the right

What causes this issue?

In the join definitions for object type &V1&, a definition is maintained
in which the table on the left and the table on the right are the same.
This is not allowed.

System Response

The system cannot save the data.

How to fix this error?

Change the join definition so that the table on the right is different
from the table on the left.

Procedure for System Administrators

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

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message LRM_BS007 - Join definition with same table on the left and the right ?

  The SAP error message LRM_BS007 indicates that there is a join definition in your data model where the same table is being used on both the left and right sides of the join condition. This typically occurs in the context of SAP Business Warehouse (BW) or SAP HANA modeling, where joins are defined between different tables.
  Cause:
  The error arises when you attempt to create a join between the same table, which is not allowed because it creates ambiguity in the join logic. For example, if you have a table A and you try to join A to itself without a proper alias or without a valid join condition, the system cannot determine how to process the join.
  Solution:
  To resolve this error, you can take the following steps:
  
  
  Check Join Definition: Review the join definition in your data model. Ensure that you are not unintentionally joining the same table to itself without a valid condition.
  
  
  Use Aliases: If you need to join the same table to itself (for example, to compare rows within the same table), you can use table aliases. This allows you to differentiate between the two instances of the table. For example:
  
  Instead of joining TableA to TableA, you can create an alias like TableA_1 and TableA_2 and then define the join between these two aliases.
  
  
  
  Review Join Conditions: Ensure that the join conditions are correctly defined. If you are joining the same table, make sure that the conditions logically make sense and do not create circular references.
  
  
  Check for Redundant Joins: Sometimes, the join may be redundant if the same data can be accessed through a different path in the data model. Evaluate if the join is necessary.
  
  
  Consult Documentation: If you are unsure about how to structure your joins, refer to the SAP documentation or community forums for best practices on modeling in SAP BW or HANA.
  
  
  Related Information:
  
  SAP BW Modeling: Understanding how to model data in SAP BW, including the use of InfoObjects, DataStore Objects (DSOs), and CompositeProviders.
  SAP HANA Modeling: Familiarity with calculation views, attribute views, and the use of SQLScript for complex data manipulations.
  Performance Considerations: Be aware that unnecessary joins can impact performance, so always aim for efficient data modeling practices.
  
  By following these steps, you should be able to resolve the LRM_BS007 error and create a valid join definition in your SAP data model.