How To Fix CU405 - Class & cannot have a BOM

SAP Error Message - Details

• Message type: E = Error

• Message class: CU - Variants / configuration messages

• Message number: 405

• Message text: Class & cannot have a BOM

What causes this issue?

In a dependency, you have referred to a BOM for an object, but the
object is only known as a class (so it does not yet refer to a specific
material). This data is not sufficient to determine a BOM for the
object.

System Response

Download error.

How to fix this error?

For more information on the error environment, see the application log.
Check the dependency.
References to materials in constraints and rules are formulated with
<ZH>IS_OBJECT</> instead of <ZH>IS_A</>.

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 CU405 - Class & cannot have a BOM ?

  The SAP error message CU405 indicates that a specific class (in this case, a class represented by the placeholder "&") cannot have a Bill of Materials (BOM) associated with it. This error typically arises in the context of Product Data Management (PDM) or when working with Material Management (MM) and Production Planning (PP) modules in SAP.
  Cause:
  
  Class Type Restrictions: The class you are trying to associate with a BOM may be of a type that does not support BOMs. In SAP, certain class types are designated for specific purposes and may not allow BOMs.
  Incorrect Configuration: The configuration of the class may not allow for BOM assignment. This could be due to settings in the class type or the characteristics defined within the class.
  Material Type Limitations: The material type associated with the class may not be compatible with BOMs. Some material types are not designed to have BOMs.
  Missing Authorizations: Sometimes, the user may not have the necessary authorizations to create or modify BOMs for the specified class.
  
  Solution:
  
  Check Class Type: Verify the class type of the class you are working with. Ensure that it is a type that supports BOMs. You can do this by navigating to the class definition in the SAP system.
  Review Class Configuration: Check the configuration settings of the class. Ensure that it is set up correctly to allow BOMs. You may need to consult with your SAP configuration team or refer to SAP documentation for guidance.
  Material Type Verification: Ensure that the material type associated with the class is one that allows BOMs. If necessary, consider changing the material type or creating a new class that is compatible.
  Authorization Check: Ensure that you have the necessary authorizations to create or modify BOMs. If you suspect authorization issues, contact your SAP security team to review your access rights.
  Consult SAP Notes: Check for any relevant SAP Notes or documentation that may provide additional insights or solutions related to this error message.
  
  Related Information:
  
  SAP Documentation: Refer to the official SAP Help Portal for detailed information on class types, BOMs, and their configurations.
  Transaction Codes: Familiarize yourself with relevant transaction codes such as CL02 (Change Class), CL03 (Display Class), and CS01 (Create BOM) to navigate the system effectively.
  SAP Community: Engage with the SAP Community forums to seek advice from other users who may have encountered similar issues.
  
  By following these steps, you should be able to identify the cause of the CU405 error and implement the appropriate solution.