How To Fix UD304 - Entity type & does not exist

SAP Error Message - Details

• Message type: E = Error

• Message class: UD - EDM - Enterprise Data Model

• Message number: 304

• Message text: Entity type & does not exist

What causes this issue?

It appears as if there is an inconsistency in the data model. The
entity types belonging to a relationship, specialization or
generalization cannot be read. An entity type no longer exists,
although it is still being used.
This inconsistency could have been caused by a faulty transport.

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?

Check your model.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message UD304 - Entity type & does not exist ?

  The SAP error message UD304, which states "Entity type & does not exist," typically occurs when the system is unable to find a specified entity type in the context of a data operation, such as when working with the SAP S/4HANA system or when using the SAP Gateway for OData services.
  Cause:
  
  Incorrect Entity Type Name: The entity type specified in the request does not match any existing entity types defined in the data model.
  Missing Data Model: The data model or service definition may not be properly activated or may not include the specified entity type.
  Authorization Issues: The user may not have the necessary authorizations to access the specified entity type.
  Transport Issues: If the entity type was recently created or modified, it may not have been transported correctly to the system where the error is occurring.
  Service Not Registered: The OData service that includes the entity type may not be registered or activated in the SAP Gateway.
  
  Solution:
  
  Check Entity Type Name: Verify that the entity type name used in the request is correct and matches the name defined in the data model.
  Activate the Service: If you are using an OData service, ensure that the service is activated in the SAP Gateway. You can do this using transaction code /IWFND/MAINT_SERVICE.
  Check Data Model: Ensure that the data model that includes the entity type is properly defined and activated. You can check this in the relevant development environment (e.g., using transaction SE80).
  Authorization Check: Ensure that the user has the necessary authorizations to access the entity type. This may involve checking roles and authorizations in transaction PFCG.
  Transport Check: If the entity type was recently created or modified, ensure that the changes have been transported correctly to the target system.
  Debugging: If the issue persists, consider debugging the request to see where the failure occurs and gather more information about the context of the error.
  
  Related Information:
  
  Transaction Codes: 
  
  /IWFND/MAINT_SERVICE: To manage OData services.
  SE80: To access the Object Navigator for checking data models.
  PFCG: To manage roles and authorizations.
  
  
  SAP Notes: Check for any relevant SAP Notes that may address known issues related to this error message.
  Documentation: Review the SAP documentation for the specific version of the system you are using, as there may be version-specific considerations.
  
  If the problem persists after following these steps, it may be beneficial to consult with your SAP Basis or development team for further investigation.