How To Fix UD804 - Reference Model not assigned to an object type in the Object Repository

SAP Error Message - Details

• Message type: E = Error

• Message class: UD - EDM - Enterprise Data Model

• Message number: 804

• Message text: Reference Model not assigned to an object type in the Object Repository

What causes this issue?

You would like to switch from a data model to the object type assigned
to it. This, however, is not possible since no object type has been
assigned to the referenced data model.

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?

Please check to see whether you are in the desired data model.
Go to maintenance of the referenced model.
If required, assign to this data model an object type. To do this,
switch to the change modus and then switch again to the object type.
You then arrive in the Business Object Repository and can there create
the object. The object is created under the data model name and the
short text of the data model is adopted automatically.
On the other hand, you can terminate the Data Modeler and start the
Business Object Repository. Switch to the change modus of the object
types. There select the suitable object type. Then move to Basic data
and record in field Data model the name of the current referenced
model.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message UD804 - Reference Model not assigned to an object type in the Object Repository ?

  The SAP error message UD804, which states "Reference Model not assigned to an object type in the Object Repository," typically occurs in the context of SAP's Object Repository when there is a missing or incorrect assignment of a reference model to a specific object type. This can happen in various scenarios, particularly when working with SAP's data modeling tools or when trying to create or modify objects that rely on reference models.
  Cause:
  
  Missing Assignment: The reference model has not been assigned to the object type in the Object Repository.
  Incorrect Configuration: There may be a misconfiguration in the settings related to the object type or reference model.
  Transport Issues: If the reference model was transported from another system, it may not have been properly assigned in the target system.
  Versioning Issues: The reference model may have been updated or changed, and the object type is still pointing to an outdated version.
  
  Solution:
  
  
  Check Object Type Configuration:
  
  Go to the Object Repository and check the configuration for the specific object type that is causing the error.
  Ensure that the reference model is correctly assigned to the object type.
  
  
  
  Assign Reference Model:
  
  If the reference model is not assigned, you can assign it by navigating to the relevant configuration area in the SAP system.
  Use transaction codes like SE11 (Data Dictionary) or SE80 (Object Navigator) to find the object type and assign the reference model.
  
  
  
  Transport Management:
  
  If the issue arose after a transport, check the transport logs to ensure that all necessary objects were transported correctly.
  Re-transport the reference model if necessary.
  
  
  
  Check for Updates:
  
  Ensure that you are using the latest version of the reference model. If there have been updates, make sure the object type is updated accordingly.
  
  
  
  Consult Documentation:
  
  Review SAP documentation or notes related to the specific object type and reference model for any additional configuration steps that may be required.
  
  
  
  Contact SAP Support:
  
  If the issue persists after checking the above steps, consider reaching out to SAP support for further assistance.
  
  
  
  Related Information:
  
  Transaction Codes: Familiarize yourself with relevant transaction codes such as SE11, SE80, and SE37 (for function modules) that may help in troubleshooting.
  SAP Notes: Search for SAP Notes related to error UD804 in the SAP Support Portal for any known issues or patches.
  Documentation: Review the SAP Help Portal for detailed information on Object Repository and reference models.
  
  By following these steps, you should be able to resolve the UD804 error and ensure that the reference model is properly assigned to the object type in the Object Repository.