How To Fix /IWBEP/SBOD121 - All keys of principal entity should be mapped in referential constraint

/IWBEP/SBOD121 - Overview

• Message type: E = Error

• Message class: /IWBEP/SBOD -

• Message number: 121

• Message text: All keys of principal entity should be mapped in referential constraint

Self-Explanatory Message

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/IWBEP/SBOD121 - Details

• The SAP error message /IWBEP/SBOD121 indicates that there is an issue with the mapping of keys in a referential constraint within your OData service. This error typically arises when the keys of a principal entity (the entity that is being referenced) are not properly mapped in the association or navigation property of a dependent entity.
  
  Cause:
  
  Missing Key Mapping: The keys of the principal entity are not fully mapped in the dependent entity's association.
  Incorrect Configuration: The configuration of the OData model may not correctly reflect the relationships between entities.
  Data Model Issues: There may be inconsistencies in the data model definitions, such as missing or incorrectly defined keys in the entity types.
  
  
  Solution:
  To resolve this error, you can follow these steps:
  
  
  Check Entity Definitions:
  
  Ensure that both the principal and dependent entities are correctly defined in your data model.
  Verify that all keys of the principal entity are defined and correctly mapped in the dependent entity.
  
  
  
  Review Associations:
  
  Go