Material & has commodity code &2 assigned, but no import no.

What causes this issue?

The material & has the commodity code no. & assigned to it, but no
import code number.

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?

Enter manually another import code number that can be assigned to the
material. You also have the option of searching for a number using the
pushbutton 'Information import code number'.

Error message extract from SAP system. Copyright SAP SE.