How To Fix RS_HCPR_MODEL022 - Temporal join: Derived fields cannot be joined (&1)

SAP Error Message - Details

• Message type: E = Error

• Message class: RS_HCPR_MODEL - Messages related to the HANA Composite Provider Backend

• Message number: 022

• Message text: Temporal join: Derived fields cannot be joined (&1)

Self-Explanatory Message

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• What is the cause and solution for SAP error message RS_HCPR_MODEL022 - Temporal join: Derived fields cannot be joined (&1) ?

  The SAP error message RS_HCPR_MODEL022 indicates an issue with a temporal join in a data model, specifically that derived fields cannot be joined. This error typically arises in the context of SAP HANA or SAP BW when working with data models that involve temporal joins, which are used to analyze data over time.
  Cause:
  The error occurs when you attempt to join derived fields (calculated fields or fields that are not directly from the source tables) in a temporal join. Temporal joins require that the fields being joined are directly from the underlying data sources and not derived or calculated fields. This is because temporal joins rely on the actual data values at specific points in time, and derived fields may not have a direct correlation to the time-based data.
  Solution:
  To resolve this error, you can take the following steps:
  
  
  Check the Join Conditions: Review the join conditions in your temporal join. Ensure that you are only using base fields from the source tables and not derived fields.
  
  
  Modify the Data Model: If you need to use derived fields, consider restructuring your data model. You may need to create a separate calculation view or data flow that computes the derived fields after the temporal join has been performed.
  
  
  Use Base Fields: If possible, use the original fields from the data sources for the join instead of derived fields. This may involve adjusting your calculations or logic to ensure that the necessary data is available in its base form.
  
  
  Consult Documentation: Refer to the SAP documentation for temporal joins and derived fields to understand the limitations and best practices. This can provide insights into how to structure your data models effectively.
  
  
  Testing: After making changes, test the data model to ensure that it functions correctly without errors.
  
  
  Related Information:
  
  Temporal Joins: These are used to analyze data that changes over time, allowing you to see how data points relate to each other at different time intervals.
  Derived Fields: These are fields that are calculated based on other fields in the data model, often using formulas or expressions.
  SAP HANA Documentation: For more detailed information on temporal joins and data modeling, refer to the official SAP HANA documentation or the SAP Help Portal.
  
  By following these steps and understanding the underlying concepts, you should be able to resolve the RS_HCPR_MODEL022 error and successfully implement your temporal join.