How To Fix SDDL_PARSER_MSG470 - Target fields "&1 and "&2" cannot be compared in "&3" ON condition

SAP Error Message - Details

• Message type: E = Error

• Message class: SDDL_PARSER_MSG - Message Class for DDL Parser

• Message number: 470

• Message text: Target fields "&1 and "&2" cannot be compared in "&3" ON condition

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message SDDL_PARSER_MSG470 - Target fields "&1 and "&2" cannot be compared in "&3" ON condition ?

  The SAP error message SDDL_PARSER_MSG470 indicates that there is an issue with the comparison of target fields in an ON condition of a join operation in a data model or query. This typically occurs in the context of SAP HANA or when working with SAP BW (Business Warehouse) queries.
  Cause:
  The error arises when the fields being compared in the ON condition of a join do not have compatible data types or structures. This can happen due to several reasons:
  
  Data Type Mismatch: The fields being compared may have different data types (e.g., one is a string and the other is an integer).
  Incompatible Structures: The fields may belong to different structures or domains that do not allow for direct comparison.
  Null Values: If one of the fields can contain null values, it may lead to issues during comparison.
  Field Length: The lengths of the fields being compared may differ, leading to incompatibility.
  
  Solution:
  To resolve this error, you can take the following steps:
  
  
  Check Data Types: Verify the data types of the fields involved in the comparison. Ensure that they are compatible. If necessary, you may need to cast one of the fields to match the data type of the other.
  
  
  Modify the Query: If you are using a SQL query or a data model, modify the ON condition to ensure that the fields being compared are compatible. You can use functions like CAST() or CONVERT() to change the data type of one of the fields.
  
  
  Review Field Definitions: Check the definitions of the fields in the data model or database schema. Ensure that they are defined correctly and are intended to be compared.
  
  
  Handle Null Values: If null values are a concern, consider using functions like COALESCE() to handle nulls appropriately in your comparison.
  
  
  Consult Documentation: Refer to SAP documentation or community forums for specific guidance related to the version of SAP you are using, as there may be version-specific nuances.
  
  
  Related Information:
  
  SAP Notes: Check SAP Notes for any known issues or patches related to this error message.
  SAP Community: Engage with the SAP Community forums to see if others have encountered similar issues and what solutions they have found.
  Data Modeling Best Practices: Familiarize yourself with best practices for data modeling in SAP BW or HANA to avoid such issues in the future.
  
  By following these steps, you should be able to identify the root cause of the error and implement a solution to resolve it.