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I have a comment to the first common error, that there is another thing to always check before deleting unused objects: Automatic NAT
And this can even happen in R80.10!
You might have configured some hosts or small networks to access the internet in your policy, but the hide-NAT happens on a bigger network-object not used in the policy. If you now delete the bigger network-object, there will be no warning but your NAT is not in place anymore!

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