If you can, squirt it with a hose or high powered water pistol when it starts scratching around your property. Make sure if possible that it doesn't see you when you do this, so it will associate the soaking with the behaviour.
Alternatively, get a hold of some cayenne pepper and lay a line of it along the front of your screen door. The cat will disturb it when it's scratching away and will breathe some in. This will cause it some irritation but no long term harm.
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