What causes this issue?

The hazard division code must be maintained for material &V1&.

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

System Response

How to fix this error?

Please maintain the hazard division code for the material in its
hazardous substance master record via the transaction code
<DS:TRAN.HSMD>HSMD</>

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.