How To Fix MDG_MDF305 - 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: 305

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

What causes this issue?

You defined hierarchy &V1& with multiple root nodes. However, this
hierarchy only allows one root node per hierarchy.

System Response

Action 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_MDF305 - Hierarchy &1 has more than one root node ?

  The SAP error message MDG_MDF305, which states "Hierarchy &1 has more than one root node," typically occurs in the context of Master Data Governance (MDG) when dealing with hierarchical data structures. This error indicates that the hierarchy you are trying to create or modify has multiple root nodes, which is not allowed in a proper hierarchical structure.
  Cause:
  
  Multiple Root Nodes: The hierarchy you are trying to create or modify has more than one node that does not have a parent, meaning there are multiple starting points in the hierarchy.
  Data Integrity Issues: There may be issues with the data integrity where nodes are incorrectly defined, leading to multiple entries being treated as root nodes.
  Incorrect Hierarchical Structure: The structure of the hierarchy may not be correctly defined, leading to confusion in the parent-child relationships.
  
  Solution:
  
  Review Hierarchy Structure: Check the hierarchy structure you are trying to create or modify. Ensure that there is only one root node. A root node is defined as a node that does not have any parent.
  Adjust Parent-Child Relationships: If you find multiple root nodes, you will need to adjust the relationships so that all nodes are properly linked to a single root node.
  Data Cleanup: If the hierarchy is being imported or created from existing data, ensure that the data is cleaned up to remove any inconsistencies that may lead to multiple root nodes.
  Use Hierarchy Maintenance Tools: Utilize SAP's hierarchy maintenance tools to visualize and correct the hierarchy structure. This can help in identifying where the issues lie.
  Validation: After making changes, validate the hierarchy to ensure that it meets the requirements and does not produce the same error.
  
  Related Information:
  
  SAP Documentation: Refer to the official SAP documentation for Master Data Governance for more detailed information on managing hierarchies.
  Transaction Codes: Familiarize yourself with relevant transaction codes in SAP that can help you manage and maintain hierarchies, such as MDG_MDF or other related transaction codes.
  Support Notes: Check SAP Support Portal for any relevant notes or updates regarding this error message, as there may be specific patches or updates that address known issues.
  
  By following these steps, you should be able to resolve the MDG_MDF305 error and ensure that your hierarchy is correctly structured.