A pricing reference material is also defined for &

What causes this issue?

You have entered a pricing reference material for which a pricing
reference material has already been entered. Such chains of pricing
reference materials are not supported by the system.

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?

You have the following options:
Use another pricing reference material.
Remove the pricing reference material for &V1&.

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.