Change request with customer objects is not possible at SAP

What causes this issue?

You cannot transport the object &V1& &V2& &V3& to the customer with a
transportable change request, since the object is in the customer
namespace. You cannot lock the object.

System Response

The function terminates.

How to fix this error?

You can only use objects in the SAP namespace to transport your
functions to the customer.
Give your objects a name from the SAP namespace.
If you only want to use this object internally, you can transport it
with a different request type.
Note
If this is the case, also give the object a name from the SAP
namespace.

Error message extract from SAP system. Copyright SAP SE.