How To Fix APS_CCV_DATA_SOURCE006 - Cardinality is likely 'Zero or One'

SAP Error Message - Details

• Message type: E = Error

• Message class: APS_CCV_DATA_SOURCE - Data sources

• Message number: 006

• Message text: Cardinality is likely 'Zero or One'

What causes this issue?

As you have mapped all key fields of the associated data source, the
result set is likely to consist of one table row at the most.

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?

It is recommended to change the cardinality to ?Zero or One?.

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 APS_CCV_DATA_SOURCE006 - Cardinality is likely 'Zero or One' ?

  The SAP error message APS_CCV_DATA_SOURCE006, which indicates that "Cardinality is likely 'Zero or One'," typically arises in the context of data modeling or data source configuration within SAP systems, particularly in SAP BW (Business Warehouse) or SAP HANA environments. This error suggests that there is a mismatch in the expected cardinality of a data source or a data model, meaning that the system expects either zero or one instance of a particular entity, but the configuration may not align with this expectation.
  Cause:
  
  Data Model Configuration: The error often occurs when the data model is configured incorrectly, leading to a situation where the system expects a one-to-one relationship but finds a one-to-many or many-to-many relationship instead.
  Data Source Definition: If a data source is defined with incorrect cardinality settings, it can lead to this error. For example, if a data source is expected to return a single record but is configured to return multiple records, this mismatch can trigger the error.
  Join Conditions: In cases where multiple tables are joined, if the join conditions do not enforce the expected cardinality, it can lead to this error.
  Data Integrity Issues: If the underlying data does not conform to the expected structure (e.g., missing keys or duplicate entries), it can also cause this error.
  
  Solution:
  
  Review Data Model: Check the data model configuration to ensure that the cardinality settings are correct. Ensure that relationships between entities are defined properly (e.g., one-to-one, one-to-many).
  Adjust Data Source Settings: If you are using a data source, verify its configuration. Ensure that it is set up to return the expected number of records. If it should return a single record, ensure that the query or data extraction logic reflects that.
  Check Join Conditions: If the error arises from a join operation, review the join conditions to ensure they enforce the expected cardinality. You may need to adjust the join type or conditions to ensure that they align with the expected data structure.
  Data Quality Check: Perform a data quality check on the underlying data to ensure that there are no duplicates or missing keys that could lead to unexpected results.
  Testing: After making adjustments, test the data source or model to ensure that the error is resolved and that the expected data is returned.
  
  Related Information:
  
  Documentation: Refer to SAP documentation for specific guidelines on data modeling and cardinality settings in your version of SAP BW or HANA.
  SAP Community: Engage with the SAP Community forums for insights from other users who may have encountered similar issues.
  SAP Notes: Check for any relevant SAP Notes that may address this specific error or provide additional troubleshooting steps.
  
  By following these steps, you should be able to identify the root cause of the APS_CCV_DATA_SOURCE006 error and implement a solution to resolve it.