Cannot reset to original; the upgrade mode has not been specified

What causes this issue?

You are attempting to execute the function "Reset to original" for an
object whose update mode is not determined.

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?

Start the program to determine the upgrade mode.

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.