How To Fix VMP_MSG383 - Cannot load BOM; material already exists in the target panel

VMP_MSG383 - Overview

• Message type: E = Error

• Message class: VMP_MSG - VMP Message Manager

• Message number: 383

• Message text: Cannot load BOM; material already exists in the target panel

What causes this issue?

Using the <LS>Load BOM </>button you're trying to load a BOM for a
material that already exists for a component in the <LS>Target </>panel.

System Response

The system displays an error message and doesn't allow you load the BOM
for the material that already exists for a component in the <LS>Target
</>panel.

How to fix this error?

If you want to load the BOM, select the material in the <LS>Target
</>panel and then choose the <LS>Load BOM </>button.

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 VMP_MSG383 - Cannot load BOM; material already exists in the target panel ?

  SAP Error Message:
  VMP_MSG383 Cannot load BOM; material already exists in the target panel
  
  
  Cause:
  This error occurs during the process of loading or copying a Bill of Materials (BOM) in SAP, typically when using the Engineering Workbench (transaction CS11, CS12, or related tools). The system detects that the material you are trying to add or load into a BOM structure already exists in the target panel (i.e., the current BOM structure or assembly level). 
  In other words, the BOM structure you are trying to create or modify already contains the material at the same level or position, and SAP prevents duplication to maintain BOM integrity.
  
  Explanation:
  
  The BOM structure is hierarchical, and each component/material should appear only once at a given level.
  Attempting to insert or load a BOM where the same material is already present in the target node causes this error.
  This is a safeguard to avoid circular references or redundant entries in the