How To Fix SADL_GW_DT_SB_UI018 - Property '&1' of entity type '&2' uses aggregation function

SAP Error Message - Details

• Message type: E = Error

• Message class: SADL_GW_DT_SB_UI - Gateway Service Builder UI Integration for SADL

• Message number: 018

• Message text: Property '&1' of entity type '&2' uses aggregation function

What causes this issue?

Property "&V1&" uses aggregation function but the entity type "&V2&" has
no aggregation semantic.

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?

Add semantic "aggregation" to the entity type "&V2&".

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_DT_SB_UI018 - Property '&1' of entity type '&2' uses aggregation function ?

  The SAP error message SADL_GW_DT_SB_UI018 indicates that there is an issue with a property in an entity type that is using an aggregation function. This typically occurs in the context of SAP Gateway and OData services, where the system is trying to process a request that involves an aggregation function on a property that is not supported in the current context.
  Cause:
  The error is usually caused by one of the following reasons:
  
  Aggregation Function Misuse: The property specified in the error message is being used in a way that requires aggregation (like SUM, AVG, COUNT, etc.), but the context does not support it.
  Model Definition Issues: The entity type or the property may not be correctly defined in the data model, leading to confusion in how the data should be aggregated.
  Incompatible Query: The OData query being executed may be trying to retrieve data in a way that is incompatible with the underlying data model or the service implementation.
  
  Solution:
  To resolve this error, you can take the following steps:
  
  
  Check the OData Query: Review the OData query that is being executed. Ensure that it is not trying to perform aggregation on properties that are not designed to support it. If aggregation is needed, ensure that the query is structured correctly.
  
  
  Review Entity Type Definition: Check the definition of the entity type and the properties involved. Make sure that the properties are defined correctly and that any aggregation functions are applied to the correct properties.
  
  
  Adjust the Service Implementation: If you are developing or maintaining the OData service, ensure that the service implementation correctly handles aggregation functions. This may involve modifying the service logic to support the required aggregations.
  
  
  Use the Correct Data Model: If the property is meant to be aggregated, ensure that it is defined in a way that supports aggregation in the data model. This may involve changing the data type or the way the property is calculated.
  
  
  Consult Documentation: Refer to the SAP documentation for the specific version you are using to understand the limitations and requirements for using aggregation functions in OData services.
  
  
  Related Information:
  
  SAP Gateway: This is the technology that allows you to connect devices, environments, and platforms to SAP systems. Understanding how it handles OData services is crucial.
  OData Protocol: Familiarize yourself with the OData protocol, especially how it handles queries, filters, and aggregations.
  SAP Community: Engage with the SAP Community forums for insights and solutions from other users who may have encountered similar issues.
  SAP Notes: Check for any relevant SAP Notes that may address this specific error or provide additional guidance.
  
  By following these steps, you should be able to identify the root cause of the error and implement a suitable solution.