How To Fix MDG_MDF304 - Hierarchy &1 has more than one root node

SAP Error Message - Details

• Message type: E = Error

• Message class: MDG_MDF - Master Data: Messages

• Message number: 304

• Message text: Hierarchy &1 has more than one root node

What causes this issue?

You defined hierarchy &V1& with multiple root nodes. However, the
hierarchy-defining characteristic only allows one root node per
hierarchy.

System Response

Processing terminated

How to fix this error?

Correct 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_MDF304 - Hierarchy &1 has more than one root node ?

  The SAP error message MDG_MDF304 indicates that there is an issue with the hierarchy structure in your Master Data Governance (MDG) system. Specifically, it means that the hierarchy you are trying to create or modify has more than one root node, which is not allowed in a proper hierarchical structure.
  Cause:
  
  Multiple Root Nodes: The hierarchy you are trying to create has multiple entries that are considered root nodes. In a valid hierarchy, there should only be one root node from which all other nodes branch out.
  Incorrect Data Entry: There may be incorrect or duplicate entries in the data that lead to multiple nodes being treated as root nodes.
  Data Model Issues: The underlying data model may not be correctly defined, leading to inconsistencies in how nodes are recognized.
  
  Solution:
  
  Review the Hierarchy Structure: Check the hierarchy you are trying to create or modify. Ensure that there is only one root node. You can do this by examining the parent-child relationships in your data.
  Adjust Data Entries: If you find multiple root nodes, you will need to adjust your data entries. This may involve:
  
  Merging nodes that should be part of the same hierarchy.
  Reassigning child nodes to a single root node.
  
  
  Use the MDG Tools: Utilize the MDG tools to visualize the hierarchy and identify where the issue lies. This can help you understand the relationships between nodes better.
  Data Validation: Implement data validation rules to prevent the creation of hierarchies with multiple root nodes in the future.
  Consult Documentation: Refer to SAP documentation or help resources for specific guidelines on creating and managing hierarchies in MDG.
  
  Related Information:
  
  Hierarchy Definition: In SAP MDG, a hierarchy is a structured representation of data where each node can have one or more child nodes, but only one parent node.
  MDG Configuration: Ensure that your MDG configuration aligns with the business requirements for hierarchy management.
  SAP Notes: Check for any relevant SAP Notes that may address known issues or provide additional guidance on this error message.
  Support: If the issue persists after following the above steps, consider reaching out to SAP support for further assistance.
  
  By addressing the root cause of the error and ensuring that your hierarchy adheres to the required structure, you should be able to resolve the MDG_MDF304 error.