The material &1 is already listed; only display possible

What causes this issue?

You want to create or change a bill of material (BOM) for the
<DS:GLOS.3526BBD7AFAB52B9E10000009B38F974>structured material</> &V1&.
However, this material has already been listed. To prevent data
inconsistencies, the BOM may no longer be changed.

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?

INCLUDE BOM OBJECT DOKU ID TX LANGUAGE EN

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.