How To Fix UCR0004 - Reference characteristic &1 is ambiguous

SAP Error Message - Details

• Message type: E = Error

• Message class: UCR0 - Messages for Reporting of Transaction Data

• Message number: 004

• Message text: Reference characteristic &1 is ambiguous

What causes this issue?

You have specified more than one value for reference characteristic
&V1& in the global filter or within a row/column/cell of the report of
the query. However, a unique value is required.

System Response

Processing is terminated.

How to fix this error?

Always specify reference characteristic &V1& in a unique way in the
global filter or within a row/column/cell of the query.

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 UCR0004 - Reference characteristic &1 is ambiguous ?

  The SAP error message UCR0004, which states "Reference characteristic &1 is ambiguous," typically occurs in the context of SAP's classification system, particularly when dealing with characteristics in a classification hierarchy or when using characteristics in a variant configuration scenario.
  Cause:
  The error indicates that the system has encountered a situation where a reference characteristic is not uniquely identifiable. This can happen for several reasons:
  
  Duplicate Characteristics: There may be multiple characteristics with the same name or identifier in the classification system, leading to ambiguity.
  Incorrect Configuration: The configuration of the characteristics or classes may not be set up correctly, causing the system to be unable to determine which characteristic to reference.
  Inheritance Issues: If characteristics are inherited from superclasses or parent classes, and there are conflicting definitions, this can lead to ambiguity.
  Missing or Incorrect Assignments: Characteristics may not be properly assigned to the class or object, leading to confusion in the reference.
  
  Solution:
  To resolve the UCR0004 error, you can take the following steps:
  
  Check for Duplicates: Review the characteristics in the classification system to ensure there are no duplicates. If duplicates exist, rename or remove them as necessary.
  Review Configuration: Ensure that the characteristics are correctly configured and that there are no conflicting definitions. Check the class and object assignments to ensure they are correct.
  Examine Inheritance: If you are using inheritance, check the parent classes for conflicting characteristics. Make sure that the characteristics are uniquely defined across the hierarchy.
  Adjust References: If you are referencing characteristics in a variant configuration, ensure that the references are clear and unambiguous. You may need to specify the class or context in which the characteristic is being used.
  Use Transaction Codes: Utilize transaction codes like CL02 (Change Class) or CL03 (Display Class) to review and modify the characteristics and classes as needed.
  
  Related Information:
  
  SAP Notes: Check SAP Notes for any specific patches or updates related to this error message. SAP frequently updates its knowledge base with solutions for common issues.
  Documentation: Refer to the SAP Help Portal for detailed documentation on classification and variant configuration, which may provide additional insights into managing characteristics.
  Community Forums: Engage with SAP community forums or user groups where similar issues may have been discussed, and solutions shared.
  
  By following these steps, you should be able to identify and resolve the ambiguity causing the UCR0004 error in your SAP system.