The links for the charac. to material no. &1 will also be changed

What causes this issue?

Material &V1& is still being used in the characteristics with the
following sort numbers: &V2&

System Response

When the sort number is changed in the <LS>list of materials</>, the
references in the characteristics is also changed.

How to fix this error?

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.