How To Fix UCFE038 - Only a key figure can be specified in a predefined structure

SAP Error Message - Details

• Message type: E = Error

• Message class: UCFE - Messages for Data Entry Layouts

• Message number: 038

• Message text: Only a key figure can be specified in a predefined structure

What causes this issue?

A range may not be defined for a characteristic in a data-driven
structure or a predefined fixed structure.

System Response

The data entry layout cannot be saved.

How to fix this error?

Define the characteristic as a single value.

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 UCFE038 - Only a key figure can be specified in a predefined structure ?

  The SAP error message UCFE038, which states "Only a key figure can be specified in a predefined structure," typically occurs in the context of SAP BW (Business Warehouse) or SAP HANA when working with queries, data models, or InfoProviders. This error indicates that there is an issue with the structure of the data being processed, specifically that a non-key figure (like a characteristic or attribute) is being used in a context where only key figures are allowed.
  Cause:
  
  Incorrect Structure Definition: The predefined structure you are using is designed to accept only key figures, but you may have included characteristics or attributes that are not key figures.
  Query Design Issues: In the query designer, you might have inadvertently added a characteristic to a section of the query that is meant for key figures only.
  Data Model Configuration: The data model or InfoProvider may not be correctly configured to handle the data types being used.
  
  Solution:
  
  Review the Structure: Check the predefined structure you are using and ensure that only key figures are included. Remove any characteristics or attributes that do not belong.
  Adjust Query Design: If you are working in the query designer, ensure that you are placing characteristics in the appropriate sections (e.g., rows, columns) and that key figures are placed in the correct areas designated for them.
  Modify Data Model: If the issue is related to the data model, review the InfoProvider settings and ensure that the key figures are correctly defined and that no non-key figures are included in the structure.
  Consult Documentation: Refer to SAP documentation or help resources for guidance on the specific structure you are working with, as there may be additional constraints or requirements.
  
  Related Information:
  
  Key Figures vs. Characteristics: In SAP BW, key figures are numerical values that can be aggregated (e.g., sales amount, quantity), while characteristics are descriptive attributes (e.g., customer name, product type). Understanding the difference is crucial for proper data modeling.
  SAP Notes and Support: If the issue persists, consider checking SAP Notes for any known issues or patches related to this error message. You can also reach out to SAP support for assistance.
  Training and Resources: If you are new to SAP BW or data modeling, consider taking training courses or reviewing online resources to better understand how to work with key figures and structures.
  
  By following these steps, you should be able to resolve the UCFE038 error and ensure that your data structures are correctly configured for your SAP BW or HANA environment.