No phys. inventory possible for this material

What causes this issue?

The material has a <GL:material_type>material type</> that is not
managed in stock on a quantity basis.

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 a different material or cancel the processing.

Error message extract from SAP system. Copyright SAP SE.