How To Fix AQQIS_CNTRL004 - Relationships cannot be inserted as left-outer condition

AQQIS_CNTRL004 - Overview

• Message type: E = Error

• Message class: AQQIS_CNTRL - Join-Control InfoSet

• Message number: 004

• Message text: Relationships cannot be inserted as left-outer condition

Self-Explanatory Message

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AQQIS_CNTRL004 - Details

• The SAP error message AQQIS_CNTRL004, which states "Relationships cannot be inserted as left-outer condition," typically occurs in the context of SAP BW (Business Warehouse) or SAP HANA when dealing with data modeling, particularly when defining relationships between InfoObjects or data sources.
  
  Cause:
  This error usually arises when there is an attempt to create a relationship that is not compatible with the left-outer join condition. In SAP BW, relationships between InfoObjects can be defined as inner or outer joins. A left-outer join means that all records from the left table (or InfoObject) are included, even if there are no matching records in the right table. However, certain conditions or configurations may prevent the establishment of such relationships, leading to this error.
  Common causes include:
  
  Incompatible Data Types: The data types of the fields being joined may not match.
  Incorrect Cardinality: The cardinality settings (1:1, 1:n, n:m) may not be correctly defined for the relationship.
  Missing Key Fields: