Error in fixed rule: Material &1

What causes this issue?

Error in <DS:GLOS.AC02D97D4308D511BCBC0800060D9C68>Fixing rule</>:
Material &V1&.

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?

A program error has occurred.
Notifiy SAP. NOte that the assignment for other materials may also be
incorrect because of the hierarchical dependencies.

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.