How To Fix ESH_CDS_VAL017 - Field &1 of view &2 derived from &3 which involves an UNIONALL CLAUSE

SAP Error Message - Details

• Message type: E = Error

• Message class: ESH_CDS_VAL -

• Message number: 017

• Message text: Field &1 of view &2 derived from &3 which involves an UNIONALL CLAUSE

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message ESH_CDS_VAL017 - Field &1 of view &2 derived from &3 which involves an UNIONALL CLAUSE ?

  The SAP error message ESH_CDS_VAL017 typically indicates an issue with a field in a Core Data Services (CDS) view that is derived from a UNION ALL clause. This error can occur when there are inconsistencies or conflicts in the data types or definitions of the fields being combined in the UNION ALL operation.
  Cause:
  
  Data Type Mismatch: The fields being combined in the UNION ALL clause must have compatible data types. If one field is of type STRING and another is of type INTEGER, this will lead to an error.
  Field Definition Conflicts: The fields in the different parts of the UNION ALL must have the same name and compatible definitions. If they differ in length, precision, or other attributes, the error will occur.
  Inconsistent Field Properties: If the fields have different properties (like nullable vs. non-nullable), this can also trigger the error.
  
  Solution:
  
  Check Data Types: Ensure that the fields being combined in the UNION ALL clause have the same data type. If necessary, use type casting to align the data types.
  Align Field Definitions: Make sure that the fields in each part of the UNION ALL have the same name and compatible definitions. This includes checking lengths, precision, and other attributes.
  Review the CDS View: Look at the definition of the CDS view and the underlying tables or views to ensure that the fields are defined consistently.
  Test Each Part Separately: If possible, test each part of the UNION ALL separately to identify which part is causing the issue.
  Use SQL Trace: If the issue persists, consider using SQL trace (ST05) to get more insights into the query execution and identify the exact point of failure.
  
  Related Information:
  
  CDS Views: Core Data Services (CDS) are a way to define semantic data models in SAP. They allow for the creation of complex views on top of database tables.
  UNION ALL Clause: This SQL operation combines the results of two or more SELECT statements. It includes all records from both queries, including duplicates.
  SAP Notes and Documentation: Check SAP Notes for any known issues or updates related to this error message. The SAP Help Portal may also provide additional context and examples.
  
  If you continue to face issues after trying the above solutions, consider reaching out to your SAP support team or consulting the SAP Community for further assistance.