& has itself a pricing reference material in the distribution chain &/&

What causes this issue?

You wanted to assign the pricing reference material &V1& to this
material. However, this is not possible because a pricing reference
material has already been assigned to the pricing reference material
&V1& in sales organization &V2& and distribution channel &V3&.

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?

If you want to assign the pricing reference material &V1& to this
material, delete the assignment of the other pricing reference
material.

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.