Material type differs from material type & of material &

What causes this issue?

The <GL:material_type>material type</> you entered differs from
material type &V1&, which has been assigned to the
<GL:material>material</> in the <GL:material_master_record>material
master record</>.

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?

INCLUDE NA_EINGABE_PRUEFEN LANGUAGE EN
If the material number is correct, you must enter material type &V1&.

Error message extract from SAP system. Copyright SAP SE.