How To Fix GG596 - Check the cardinality and the type of the foreign key

GG596 - Overview

• Message type: E = Error

• Message class: GG - Messages for FI-SL customizing

• Message number: 596

• Message text: Check the cardinality and the type of the foreign key

What causes this issue?

The cardinality must be 1:CN. You should choose 'Key fields/candidates'
as the foreign key type.

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?

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message GG596 - Check the cardinality and the type of the foreign key ?

  The SAP error message GG596, which states "Check the cardinality and the type of the foreign key," typically occurs in the context of data modeling or database design within SAP systems, particularly when working with the Data Dictionary (DDIC) or when defining relationships between database tables.
  
  Cause:
  
  
  Cardinality Issues: This error often arises when there is a mismatch in the expected cardinality between the primary key of the parent table and the foreign key in the child table. Cardinality refers to the nature of the relationship between two tables (e.g., one-to-one, one-to-many, many-to-many).
  
  
  Data Type Mismatch: The data types of the foreign key and the primary key must match. If there is a discrepancy in data types (e.g., one is an integer and the other is a string), this error can occur.
  
  
  Missing Foreign Key Definition: If a foreign key relationship is not properly defined in the Data Dictionary, it can lead to this