Follow-up/replacement material & is a reference material

What causes this issue?

Follow-up/replacement materials <ZH>cannot</> belong to the following
material categories:
Generic material
Merchandise category material
Hierarchy material
Group material
Merchandise category reference material
Standard material

System Response

If the follow-up/replacement material belongs to one of the above
material categories, the system does not create any
follow-up/replacement material relationships.

How to fix this error?

INCLUDE ISR_CHECK

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.