How To Fix AQV591 - Illegal left outer join between tables & - & - &.

AQV591 - Overview

• Message type: E = Error

• Message class: AQV - Message texts for SAP Query

• Message number: 591

• Message text: Illegal left outer join between tables & - & - &.

What causes this issue?

In the definition of a join, this operation would result in a reference
of the right table of a left-outer join to the right table of another
left-outer join.
This is not allowed.

System Response

The incorrect link was removed or converted to an inner join.

How to fix this error?

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

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.

AQV591 - Details

• The SAP error message AQV591 indicates that there is an illegal left outer join between tables in your query. This typically occurs in the context of ABAP queries or when using the SAP Query tool, where the system detects that the join conditions between the specified tables are not valid or not allowed.
  
  Cause:
  
  Invalid Join Conditions: The tables being joined do not have a valid relationship defined in the data dictionary, or the join conditions do not make sense logically.
  Data Model Constraints: The tables may not be designed to be joined in the way specified, possibly due to missing foreign key relationships.
  Query Design Issues: The way the query is structured may not comply with the rules for outer joins in SAP.
  
  
  Solution:
  
  Check Table Relationships: Verify that the tables you are trying to join have a valid relationship. You can do this by checking the data dictionary (SE11) for foreign key relationships.
  Review Join