How To Fix MSG_UH179 - Line &1: Each node can only have one type of child node.

SAP Error Message - Details

• Message type: E = Error

• Message class: MSG_UH - Universal Hierarchy Message Class

• Message number: 179

• Message text: Line &1: Each node can only have one type of child node.

Self-Explanatory Message

Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of messages in the SAP system have a message text, however this is frequently insufficient to comprehend or resolve the problem.

To make things easier, more detailed information is frequently added to describe the issue, how to fix it, and the necessary steps or configuration modifications.

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Smart SAP Assistant

• What is the cause and solution for SAP error message MSG_UH179 - Line &1: Each node can only have one type of child node. ?

  The SAP error message MSG_UH179 indicates that there is a structural issue in the hierarchy of nodes within a certain configuration or data structure. Specifically, the error states that "Each node can only have one type of child node," which means that the system is expecting a specific type of child node under a parent node, but it has encountered multiple types or an unexpected type.
  Cause:
  
  
  Incorrect Hierarchical Structure: The most common cause of this error is that the hierarchical structure defined in the configuration does not adhere to the rules set by the system. For example, if a parent node is defined to only allow a specific type of child node, and another type is added, this error will occur.
  
  
  Data Entry Errors: During data entry or configuration, users may inadvertently assign multiple types of child nodes to a single parent node.
  
  
  Configuration Issues: If the configuration settings for the nodes are not properly defined, it can lead to this error. This might happen during the setup of organizational structures, product hierarchies, or other similar configurations.
  
  
  Solution:
  
  
  Review Hierarchical Structure: Check the hierarchy of nodes in the configuration. Ensure that each parent node has only the allowed type of child nodes. You may need to remove or reassign child nodes that do not conform to the expected structure.
  
  
  Correct Data Entries: If the error is due to incorrect data entries, go through the entries and correct any that do not comply with the expected node types.
  
  
  Consult Documentation: Refer to the SAP documentation or configuration guides related to the specific module you are working with. This can provide insights into the expected structure and types of nodes.
  
  
  Use Transaction Codes: If applicable, use relevant transaction codes (like SE11 for data dictionary, SE80 for object navigator, etc.) to analyze the structure and make necessary adjustments.
  
  
  Testing: After making changes, test the configuration to ensure that the error is resolved and that the hierarchy functions as intended.
  
  
  Related Information:
  
  
  SAP Notes: Check SAP Notes for any known issues or patches related to this error message. SAP frequently updates its knowledge base with solutions for common problems.
  
  
  Community Forums: Engage with SAP community forums or user groups. Other users may have encountered the same issue and can provide insights or solutions.
  
  
  Documentation: Review the specific module documentation (e.g., SAP MM, SAP SD, etc.) for guidelines on hierarchical structures and node configurations.
  
  
  By following these steps, you should be able to identify the cause of the MSG_UH179 error and implement a solution to resolve it.