The material already exists and will be extended

What causes this issue?

The material master record has already been maintained by another
department for other views and/or for other organizational units. It
will now be extended to include data for additional views and/or
additional organizational units.

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?

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.