How To Fix SADL_GW_ATC_CONSMPTN820 - Type STRING cannot be used with ranking functions (&1)

SAP Error Message - Details

• Message type: E = Error

• Message class: SADL_GW_ATC_CONSMPTN - SADL Gateway: ATC Messages for Consumtion Annotations

• Message number: 820

• Message text: Type STRING cannot be used with ranking functions (&1)

What causes this issue?

Element &V1& is of type STRING. This type cannot be used with ranking
functions.

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?

Remove the @Consumption.ranking.parameterBinding-annotation at the
element. If this means that the ranking function cannot be applied to
the view, remove the corresponding @Consumption.ranking.activeFunctions,
too.

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 SADL_GW_ATC_CONSMPTN820 - Type STRING cannot be used with ranking functions (&1) ?

  The SAP error message SADL_GW_ATC_CONSMPTN820 indicates that there is an issue with the use of ranking functions in your ABAP CDS (Core Data Services) view or query. Specifically, the error message states that a type STRING cannot be used with ranking functions. This typically occurs when you are trying to apply ranking functions (like ROW_NUMBER(), RANK(), etc.) to a field that is of type STRING.
  Cause
  The root cause of this error is that ranking functions in SQL require numeric or date types to perform their calculations. When you attempt to use a STRING type field in a ranking function, the system raises this error because it cannot perform the necessary operations on string data.
  Solution
  To resolve this error, you can take the following steps:
  
  
  Check the Data Type: Review the fields you are using in your ranking function. Ensure that you are not using any STRING type fields directly in the ranking function.
  
  
  Convert Data Types: If you need to rank based on a string field, consider converting the string to a numeric type or using a different field that is already numeric. For example, if you are ranking based on a string representation of a number, you can convert it to an integer or decimal type.
  Example:
  SELECT ROW_NUMBER() OVER (ORDER BY CAST(your_string_field AS INT)) AS rank
  FROM your_table
  
  
  Use Alternative Logic: If ranking based on a string is essential, consider using alternative logic to achieve your goal. For instance, you might want to create a derived field that represents the string in a way that can be ranked.
  
  
  Review the Query: Ensure that the overall logic of your query is correct and that you are using the ranking functions appropriately.
  
  
  Related Information
  
  Ranking Functions: These are SQL functions that assign a rank to each row within a partition of a result set. Common ranking functions include ROW_NUMBER(), RANK(), and DENSE_RANK().
  Data Types in SAP: Familiarize yourself with the different data types supported in SAP HANA and ABAP, especially when working with CDS views and SQL queries.
  SAP Documentation: Refer to the official SAP documentation for more details on CDS views, ranking functions, and data types.
  
  By following these steps, you should be able to resolve the error and successfully implement the desired ranking logic in your SAP application.