/IWBEP/SBOD311 - Property with Unit Property assignment cannot be marked as key

SAP Error Message - Details

• Message type: E = Error

• Message class: /IWBEP/SBOD -

• Message number: 311

• Message text: Property with Unit Property assignment cannot be marked as key

Self-Explanatory Message

Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of messages in the SAP system have a message text, however this is frequently insufficient to comprehend or resolve the problem.

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AnswerBot

• What is the cause and solution for SAP error message /IWBEP/SBOD311 - Property with Unit Property assignment cannot be marked as key ?

  The SAP error message /IWBEP/SBOD311 Property with Unit Property assignment cannot be marked as key typically occurs in the context of SAP Gateway and OData service development. This error indicates that there is an issue with the way properties are defined in your OData model, specifically regarding the use of unit properties.
  Cause:
  
  
  Unit Property Assignment: The error arises when you attempt to mark a property that is associated with a unit of measure (UoM) as a key property in your OData model. In OData, key properties are used to uniquely identify an entity, and properties with unit assignments cannot be used as keys because they are not unique by themselves.
  
  
  Model Definition: The property in question may have been defined in a way that it is treated as a unit property, which is incompatible with being a key property.
  
  
  Solution:
  To resolve this error, you can take the following steps:
  
  
  Review Property Definitions: Check the definitions of the properties in your OData model. Ensure that properties that are marked as key do not have unit assignments. If a property is meant to represent a quantity with a unit, it should not be marked as a key.
  
  
  Modify the Key Properties: If you need to keep the unit property, consider using a different property as the key. You can create a separate identifier (like an ID) that can serve as the key for the entity.
  
  
  Adjust the Model: If you are using the SAP Gateway Service Builder (SEGW), go to the entity type where the error occurs and adjust the properties accordingly. Remove the key assignment from the unit property.
  
  
  Regenerate the Service: After making the necessary changes, regenerate the OData service and test it again to ensure that the error is resolved.
  
  
  Related Information:
  
  OData Model: In OData, each entity type can have one or more key properties that uniquely identify instances of that entity. Properties with unit assignments are typically used for quantities and should not be used as keys.
  SAP Gateway: The SAP Gateway allows you to create OData services that expose SAP data to external applications. Understanding the structure of OData services and how to define entity types and properties is crucial for successful service development.
  Documentation: Refer to the SAP Help Portal or the OData documentation for more details on property definitions and best practices for creating OData services.
  
  By following these steps and understanding the underlying principles, you should be able to resolve the error and successfully define your OData model.