How To Fix /IWBEP/SBUIOD059 - Cardinality N:N is not allowed.

/IWBEP/SBUIOD059 - Overview

• Message type: E = Error

• Message class: /IWBEP/SBUIOD -

• Message number: 059

• Message text: Cardinality N:N is not allowed.

Self-Explanatory Message

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To make things easier, more detailed information is frequently added to describe the issue, how to fix it, and the necessary steps or configuration modifications.

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/IWBEP/SBUIOD059 - Details

• The SAP error message /IWBEP/SBUIOD059 Cardinality N:N is not allowed typically occurs in the context of SAP Gateway and OData services when there is an attempt to define a relationship between two entities with a many-to-many (N:N) cardinality. In OData services, relationships are generally expected to be one-to-one (1:1) or one-to-many (1:N), as many-to-many relationships can complicate the data model and the way data is represented in OData.
  
  Cause:
  
  Entity Relationship Definition: The error arises when the data model defined in the SAP Gateway service includes a relationship between two entities that is defined as many-to-many (N:N). This is not supported in OData services.
  Service Implementation: The service implementation may be trying to expose a many-to-many relationship directly, which is not allowed in the OData protocol.
  
  
  Solution:
  To resolve this error, you need to adjust the data model to eliminate the many-to-many relationship. Here are some common approaches:
  
  
  Introduce a Join Entity: Create a new entity