Invalid object type: &1

What causes this issue?

You entered an object with an incorrect object identifier.

System Response

The cursor marks the error in your entry.

How to fix this error?

An object is referred to via the object identifier, class type, and
object key:
(material)(300)(nr='M4711')
The object type is the language-independent name of the master table
for the object. This name is maintained in the IMG for
<ZH>Classification</>. In the <LS>Define object types</> step, an
object identifier is maintained for each object type. This identifies
the object type in dependencies. "Material" is the object identifier
for materials.
You entered the object identifier &V1&, which is not defined. Correct
your entry accordingly.

Error message extract from SAP system. Copyright SAP SE.