How To Fix CN398 - External BOM data is not allowed (see long text)

SAP Error Message - Details

• Message type: E = Error

• Message class: CN - Meldungen für Netzpläne

• Message number: 398

• Message text: External BOM data is not allowed (see long text)

What causes this issue?

You call the bills of material transfer using external bills of
material data.
You cannot enter this data for a bills of material transfer.

System Response

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

How to fix this error?

To validly transfer bills of material you must use a unique bill of
material item. For example, the key fields of the bills of material
items must correspond to the design of SAP bills of material items.
Check whether:
The keys composed of the fields STLTY, STLNR and STLKN are unique and
not initial
The key fields STLNR and STLKN are numerical
An item category is set and this category exists in the system

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message CN398 - External BOM data is not allowed (see long text) ?

  The SAP error message CN398, which states "External BOM data is not allowed (see long text)," typically occurs in the context of Bill of Materials (BOM) processing in SAP. This error indicates that the system is trying to process a BOM that is marked as external, but the current configuration or transaction does not allow for external BOM data.
  Cause:
  
  BOM Type: The BOM you are trying to use is defined as an external BOM, which is not permitted in the current context or transaction.
  Configuration Settings: The system settings or configuration may not allow the use of external BOMs for the specific operation you are attempting.
  Transaction Context: The transaction you are using may not support external BOMs, leading to this error.
  
  Solution:
  
  Check BOM Type: Verify the type of BOM you are trying to use. If it is indeed an external BOM, consider whether you need to use a standard BOM instead.
  Change BOM Settings: If you need to use an external BOM, check the configuration settings in the SAP system to see if external BOMs can be enabled for the specific transaction or process you are working with.
  Use Standard BOM: If external BOMs are not required, switch to a standard BOM that is compatible with your transaction.
  Consult Documentation: Review the long text associated with the error message for additional context and specific instructions related to your situation.
  SAP Notes: Check for any relevant SAP Notes or updates that may address this issue or provide additional guidance.
  
  Related Information:
  
  BOM Types: Understand the different types of BOMs in SAP (e.g., standard BOM, variant BOM, external BOM) and their appropriate use cases.
  Transaction Codes: Familiarize yourself with the transaction codes related to BOM management (e.g., CS01 for creating BOMs, CS02 for changing BOMs).
  SAP Help Documentation: Refer to the official SAP Help documentation for detailed information on BOM processing and error handling.
  User Roles and Authorizations: Ensure that your user role has the necessary authorizations to work with BOMs, as restrictions may lead to errors.
  
  If the issue persists after trying the above solutions, it may be beneficial to consult with your SAP support team or a technical consultant who can provide more tailored assistance based on your specific SAP environment and configuration.