How To Fix CU347 - The order of the predecessor classes is ambiguous

SAP Error Message - Details

• Message type: E = Error

• Message class: CU - Variants / configuration messages

• Message number: 347

• Message text: The order of the predecessor classes is ambiguous

What causes this issue?

Before characteristics can be inherited in the Sales Configuration
Engine (SCE), it must be possible to determine precisely the superior
classes in the class hierarchy. This means that the sequence in which a
class was allocated must be unambiguous. This prerequisite is not met
in the following model:
CLASS_1 CLASS_2 CLASS_2 CLASS_1
\ / \ /
\ / \ /
\ / \ /
CLASS_3 CLASS_4

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

The sequence for CLASS_1 and CLASS_2 cannot be calculated. First,
CLASS_1 is the "primary" superior class, before CLASS_2, then it is the
other way around.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message CU347 - The order of the predecessor classes is ambiguous ?

  The SAP error message CU347, which states "The order of the predecessor classes is ambiguous," typically occurs in the context of class hierarchies in the SAP system, particularly when dealing with classification and object dependencies in the SAP Product Lifecycle Management (PLM) or Variant Configuration (VC) modules.
  Cause:
  The error arises when there is ambiguity in the order of predecessor classes in a class hierarchy. This can happen due to:
  
  Multiple Inheritance: If a class inherits from multiple predecessor classes that have conflicting or overlapping characteristics, the system may not be able to determine the correct order of precedence.
  Circular References: If there are circular dependencies in the class hierarchy, it can lead to ambiguity.
  Incorrect Class Configuration: Misconfiguration of classes or incorrect assignment of characteristics can also lead to this error.
  
  Solution:
  To resolve the CU347 error, you can take the following steps:
  
  
  Check Class Hierarchy:
  
  Review the class hierarchy in the Class Builder (Transaction Code: CL02).
  Ensure that there are no circular references or conflicting classes.
  
  
  
  Review Predecessor Classes:
  
  Check the predecessor classes of the class that is causing the error.
  Make sure that the order of the predecessor classes is clear and does not lead to ambiguity.
  
  
  
  Adjust Class Configuration:
  
  If you find any misconfigurations, adjust the class settings accordingly.
  Ensure that each class has a clear and distinct role in the hierarchy.
  
  
  
  Test Changes:
  
  After making adjustments, test the changes to ensure that the error no longer occurs.
  
  
  
  Consult Documentation:
  
  Refer to SAP documentation or help resources for more detailed guidance on class hierarchies and configuration.
  
  
  
  Seek Help from SAP Support:
  
  If the issue persists, consider reaching out to SAP support for assistance, especially if it involves complex class structures.
  
  
  
  Related Information:
  
  Transaction Codes: Familiarize yourself with relevant transaction codes such as CL01 (Create Class), CL02 (Change Class), and CL03 (Display Class) for managing classes.
  SAP Notes: Check for any SAP Notes related to this error message, as they may provide specific fixes or patches.
  Training and Documentation: Consider training on SAP classification and variant configuration to better understand class hierarchies and their management.
  
  By following these steps, you should be able to identify and resolve the ambiguity causing the CU347 error in your SAP system.