How To Fix KOSA401 - BOM and routing cannot be changed. See long text

KOSA401 - Overview

• Message type: E = Error

• Message class: KOSA - Product Cost Collector

• Message number: 401

• Message text: BOM and routing cannot be changed. See long text

What causes this issue?

You are attempting to change the entries for the BOM or for detailed or
rate-based planning in production version &V1& of material &V2& in
plant &V3&. Because the
<DS:GLOS.36F138F91B385A9EE10000009B38F984>controlling level</>
<ZK>BOM/Routing</> is assigned to material &V2& in plant &V3&, and
because production version &V1& is used in repetitive manufacturing,
changing the entries for the BOM or for detailed or rate-based planning
would result in the use of the wrong product cost collector in
repetitive manufacturing for production version &V1&. For this reason,
it is not permissible to change entries for the BOM or for detailed or
rate-based planning in production version &V1&.

System Response

The system does not allow any changes.

How to fix this error?

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

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 KOSA401 - BOM and routing cannot be changed. See long text ?

  The SAP error message KOSA401 indicates that a Bill of Materials (BOM) and routing cannot be changed for a particular production order or process order. This error typically arises in the context of production planning and execution within SAP, particularly when trying to modify existing BOMs or routings that are already assigned to production orders.
  Causes of KOSA401
  
  
  Order Status: The production order or process order may be in a status that does not allow changes. For example, if the order is already released, confirmed, or completed, modifications to the BOM or routing may be restricted.
  
  
  BOM/Routing Lock: The BOM or routing may be locked for changes due to various reasons, such as being in use by another order or being marked as "not changeable."
  
  
  Authorization Issues: The user may not have the necessary authorizations to make changes to the BOM or routing.
  
  
  Configuration Settings: Certain configuration settings in the system may prevent changes to