How To Fix RSODP_ABAP_CDS355 - Field &1 of type &2 with decimals &3 shouldn't be used as a key field

SAP Error Message - Details

• Message type: E = Error

• Message class: RSODP_ABAP_CDS -

• Message number: 355

• Message text: Field &1 of type &2 with decimals &3 shouldn't be used as a key field

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message RSODP_ABAP_CDS355 - Field &1 of type &2 with decimals &3 shouldn't be used as a key field ?

  The SAP error message RSODP_ABAP_CDS355 indicates that a field defined in a Core Data Services (CDS) view is being used as a key field, but it has a decimal type, which is not allowed. Key fields in CDS views must be of a type that can be uniquely identified without ambiguity, and decimal types can introduce issues with precision and rounding.
  Cause:
  The error occurs when:
  
  A field defined in the CDS view is of a decimal type (e.g., DEC, CURR, QUAN) and is being used as a key field.
  SAP does not allow decimal fields to be used as key fields because they can lead to non-unique values due to rounding or precision issues.
  
  Solution:
  To resolve this error, you can take the following steps:
  
  
  Change the Field Type: If possible, change the field type from decimal to a type that is suitable for key fields, such as integer types (e.g., INT, INT4) or character types (e.g., CHAR).
  
  
  Remove the Field from Key: If the field does not need to be a key field, you can remove it from the key definition in the CDS view.
  
  
  Use a Different Field: If the decimal field is necessary for your logic but cannot be a key, consider using a different field that can serve as a unique identifier for the key.
  
  
  Review Business Logic: Ensure that the business logic does not depend on the decimal field being a key. If it does, you may need to rethink the design of your CDS view.
  
  
  Related Information:
  
  CDS Views: Core Data Services (CDS) are a framework for defining semantically rich data models in SAP. They allow for the definition of views on database tables with a focus on performance and reusability.
  Key Fields: Key fields in a CDS view are used to uniquely identify records. They must be of a type that guarantees uniqueness.
  Data Types: Understanding the different data types in ABAP and their implications for database operations is crucial when designing CDS views.
  
  Example:
  If you have a field defined as follows in your CDS view:
  @AbapCatalog.sqlViewName: 'Z_MY_CDS_VIEW'
  define view Z_MY_CDS_VIEW as select from my_table
  {
      key my_decimal_field as KeyField,  // This will cause the error
      my_other_field
  }
  You can change it to:
  @AbapCatalog.sqlViewName: 'Z_MY_CDS_VIEW'
  define view Z_MY_CDS_VIEW as select from my_table
  {
      key my_integer_field as KeyField,  // Change to an integer type
      my_decimal_field,
      my_other_field
  }
  By following these steps, you should be able to resolve the RSODP_ABAP_CDS355 error and successfully define your CDS view.