How To Fix /IWBEP/CM_V4_MED135 - RefConstr: NavProp '&1' ('&2'): Depnt not nullable, principal nullable

/IWBEP/CM_V4_MED135 - Overview

• Message type: E = Error

• Message class: /IWBEP/CM_V4_MED -

• Message number: 135

• Message text: RefConstr: NavProp '&1' ('&2'): Depnt not nullable, principal nullable

Self-Explanatory Message

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/IWBEP/CM_V4_MED135 - Details

• The SAP error message /IWBEP/CM_V4_MED135 RefConstr: NavProp '&1' ('&2'): Depnt not nullable, principal nullable typically occurs in the context of OData services when there is a mismatch in the relationship definitions between entities in your data model. This error indicates that there is a navigation property (NavProp) that is defined in a way that violates the constraints of the relationship between the dependent and principal entities.
  
  Cause:
  
  
  Nullable vs. Non-nullable Relationships: The error suggests that the dependent entity (the one that has a foreign key reference to the principal entity) is defined as non-nullable, while the principal entity (the one being referenced) is defined as nullable. This creates a conflict because a non-nullable dependent entity cannot exist without a corresponding principal entity.
  
  
  Model Definition Issues: This can happen due to incorrect definitions in the data model, such as:
  
  Incorrectly defined foreign key relationships.
  Mismatched cardinality settings in the entity relationship definitions.
  
  
  
  
  Solution:
  To resolve this error, you