I could be wrong, but I don't think ShadowChemosh is talking about a "red flag warning." I think his intent is just to add some text to the adjustment description that would read something like, "It is possible to add this adjustment to an invalid target, so it's up to the player/GM to make sure the target is valid."
If this is true, there is no red flag, no validation error, etc. Just the text in the adjustment description.
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