How To Fix MDG_MDF301 - Hierarchies can only be top nodes

SAP Error Message - Details

• Message type: E = Error

• Message class: MDG_MDF - Master Data: Messages

• Message number: 301

• Message text: Hierarchies can only be top nodes

What causes this issue?

You attached hierarchy &v1& to a node in a different hierarchy.
However, hierarchies are only permitted at the highest level.

System Response

The hierarchy cannot be saved.

How to fix this error?

Change the hierarchy definition.

Procedure for System Administrators

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message MDG_MDF301 - Hierarchies can only be top nodes ?

  The SAP error message MDG_MDF301 ("Hierarchies can only be top nodes") typically occurs in the context of Master Data Governance (MDG) when you are trying to create or modify a hierarchy node that is not allowed to be a child node. This error indicates that the system expects the node you are trying to create or modify to be a top-level node in the hierarchy.
  Cause:
  
  Hierarchy Structure: The error usually arises when the system is configured to only allow certain nodes to be top-level nodes. If you attempt to create a node that is intended to be a child of another node, but the system does not permit it, you will encounter this error.
  Data Model Configuration: The data model or the hierarchy configuration in MDG may restrict certain nodes from being part of a hierarchy unless they are defined as top nodes.
  Incorrect Node Type: You may be trying to create a node of a type that is not allowed to be a child node in the hierarchy.
  
  Solution:
  
  Check Node Type: Ensure that the node you are trying to create or modify is intended to be a top node. If it should be a child node, verify that the parent node exists and is correctly defined.
  Review Hierarchy Configuration: Check the configuration of the hierarchy in the MDG settings. You may need to adjust the settings to allow the creation of child nodes if that is the intended design.
  Create Top Node: If you need to create a new node, ensure that you are creating it as a top node. This may involve selecting the correct options in the MDG UI or ensuring that the data model allows for the creation of such nodes.
  Consult Documentation: Refer to the SAP documentation for your specific version of MDG to understand the hierarchy rules and configurations better.
  Seek Help from SAP Support: If you are unable to resolve the issue, consider reaching out to SAP support or your internal SAP team for assistance.
  
  Related Information:
  
  MDG Hierarchy Management: Understanding how hierarchies are managed in SAP MDG is crucial. Familiarize yourself with the concepts of top nodes, child nodes, and the overall structure of hierarchies in your specific data model.
  Data Model Customization: If you have custom data models, ensure that they are correctly set up to allow for the desired hierarchy structures.
  SAP Notes and Community: Check SAP Notes for any known issues or patches related to this error. The SAP Community forums can also be a valuable resource for troubleshooting and finding solutions from other users who may have encountered similar issues.
  
  By following these steps, you should be able to identify the cause of the error and implement a solution to resolve it.