Object group "&1" not selected for transport

What causes this issue?

Object group "&V1&" is generally not chosen for transports. The objects
listed in the object group will not be transported separately.

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?

If you want to transport the objects in group "&V1&" anyway, select the
corresponding indicator under &V2& on the selection screen.

Error message extract from SAP system. Copyright SAP SE.