How To Fix DD_CDS_ANALYSIS302 - Cardinality &2 of Association &1 does not match to the ON-condition

SAP Error Message - Details

• Message type: E = Error

• Message class: DD_CDS_ANALYSIS - CDS code inspector messages

• Message number: 302

• Message text: Cardinality &2 of Association &1 does not match to the ON-condition

What causes this issue?

The cardinality &V2& of the association &V1& does not match to the given
ON-Condition:
If the key-elements of the targeted data source are all compared with an
EQUAL Operator with a corresponding element in the current data source,
a cardinality of TO-1 is expected.

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?

This warning can be suppressed by putting the pseudo comment
/*+[hideWarning] { "IDS" : [ "CARDINALITY_CHECK" ] }*/
in front of the view definition or the association definition.

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message DD_CDS_ANALYSIS302 - Cardinality &2 of Association &1 does not match to the ON-condition ?

  The SAP error message DD_CDS_ANALYSIS302 indicates a mismatch in the cardinality of an association in a Core Data Services (CDS) view. Specifically, it means that the cardinality defined for an association does not align with the conditions specified in the ON clause of the association.
  Cause:
  
  Cardinality Mismatch: The cardinality defined in the association (e.g., one-to-one, one-to-many, etc.) does not match the actual data or the conditions specified in the ON clause. For example, if the association is defined as one-to-many but the ON condition implies a one-to-one relationship, this error will occur.
  Incorrect Association Definition: The association might be incorrectly defined in the CDS view, leading to a logical inconsistency.
  Data Issues: There may be issues with the underlying data that violate the expected cardinality, such as duplicate keys in a table that should have unique keys.
  
  Solution:
  
  
  Review the Association Definition: Check the definition of the association in the CDS view. Ensure that the cardinality specified matches the actual relationship between the entities involved.
  
  For example, if the association is defined as association [0..1] to ..., ensure that the ON condition reflects that only one or no record can be matched.
  
  
  
  Check the ON Condition: Verify the ON condition of the association. Ensure that it correctly reflects the intended relationship and that it does not imply a different cardinality than what is defined.
  
  
  Data Validation: Inspect the underlying tables or views to ensure that the data adheres to the expected cardinality. Look for duplicate entries or missing keys that could cause the mismatch.
  
  
  Adjust Cardinality: If the data and the ON condition are correct, consider adjusting the cardinality in the association definition to match the actual data behavior.
  
  
  Testing: After making changes, test the CDS view to ensure that the error is resolved and that the data is being retrieved as expected.
  
  
  Related Information:
  
  
  CDS Views: Core Data Services (CDS) are a way to define semantic data models in SAP. They allow for the definition of associations, which are relationships between different entities.
  
  
  Cardinality: Cardinality defines the number of instances of one entity that can or must be associated with each instance of another entity. Common cardinalities include:
  
  One-to-One (1:1)
  One-to-Many (1:N)
  Many-to-One (N:1)
  Many-to-Many (N:N)
  
  
  
  SAP Documentation: For more detailed information, refer to the official SAP documentation on CDS views and associations, which provides guidelines on how to define and troubleshoot associations.
  
  
  By following these steps, you should be able to resolve the DD_CDS_ANALYSIS302 error and ensure that your CDS view functions correctly.