How To Fix /IWBEP/CM_MGW_RT119 - Data object '&1' has no key field assigned

SAP Error Message - Details

• Message type: E = Error

• Message class: /IWBEP/CM_MGW_RT -

• Message number: 119

• Message text: Data object '&1' has no key field assigned

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.

To make things easier, more detailed information is frequently added to describe the issue, how to fix it, and the necessary steps or configuration modifications.

Unfortunately, there isn't any extra information in this error notice.

What else can you do?

First, use our AnswerBot below to get a possible cause and solution (requires a premium subscription).

Also, review the in-depth Common Questions & Answers listed below; you could discover a solution there or be able to connect with others who have faced similar challenges.

You can also try searching the SAP support portal (support.sap.com) but you need a special user ID to access it. It is possible that an SAP support note exists that provides additional details about the mistake or even steps for fixing it.

Smart SAP Assistant

• What is the cause and solution for SAP error message /IWBEP/CM_MGW_RT119 - Data object '&1' has no key field assigned ?

  The SAP error message /IWBEP/CM_MGW_RT119 indicates that a data object in your OData service does not have a key field assigned. This is a common issue when defining OData services in SAP Gateway, and it typically arises when the metadata for the OData service is not correctly configured.
  Cause:
  
  Missing Key Field: The data object (entity) in question does not have a key field defined. In OData services, each entity must have a unique identifier (key) to allow for proper data retrieval and manipulation.
  Incorrect Data Model: The underlying data model may not have a primary key defined, or the key field is not properly mapped in the OData service.
  Model Configuration Issues: There may be issues in the way the OData model is configured, such as missing annotations or incorrect settings in the service definition.
  
  Solution:
  
  
  Define Key Field:
  
  Go to the Data Model (e.g., in SEGW transaction).
  Open the entity type that is causing the error.
  Ensure that at least one field is marked as a key field. You can do this by right-clicking on the field in the entity type and selecting "Add to Key".
  
  
  
  Check Underlying Data Structure:
  
  Ensure that the underlying database table or structure has a primary key defined. If it does not, you may need to modify the database structure to include a primary key.
  
  
  
  Regenerate the OData Service:
  
  After making changes to the key fields, regenerate the OData service. This can be done in the SEGW transaction by selecting the service and choosing the "Generate" option.
  
  
  
  Check Annotations:
  
  Ensure that the annotations in the service definition are correctly set up. Sometimes, missing or incorrect annotations can lead to issues with key field recognition.
  
  
  
  Test the Service:
  
  After making the necessary changes, test the OData service to ensure that the error is resolved and that the service behaves as expected.
  
  
  
  Related Information:
  
  OData Services: OData (Open Data Protocol) is a standard protocol for building and consuming RESTful APIs. In SAP, OData services are often used to expose business data to external applications.
  SAP Gateway: SAP Gateway is a technology that enables the connection of devices, environments, and platforms to SAP systems. It allows for the creation of OData services that can be consumed by various clients.
  Transaction Codes: 
  
  SEGW: This transaction is used to create and manage OData services in SAP Gateway.
  SE11: This transaction is used to view and modify database tables and structures, which can help in checking the key fields of the underlying data model.
  
  
  
  By following these steps, you should be able to resolve the error message /IWBEP/CM_MGW_RT119 and ensure that your OData service is correctly configured with the necessary key fields.