Object type &1 has no package

What causes this issue?

The program attempted to determine the assigned package for an object
type. However the object type is not assigned to a package.

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?

This is just for your information. No further action is required.

Error message extract from SAP system. Copyright SAP SE.