The wizard was not able to check if the objects are transportable

What causes this issue?

The wizard tried to check if the customizing objects can be written to
a transport request.

System Response

The wizard will continue, however, you will not be able to save your
changes at the end of the wizard.

How to fix this error?

Make sure that the customizing objects can be transported, i.e. the
client is set to changeable etc.

Procedure for System Administrators

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

Error message extract from SAP system. Copyright SAP SE.