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Perhaps something along these lines:

Code:
tell application id "OFOC"
	tell front document window of front document
		tell content
			set lstTask to value of selected trees where class of its value is task or class of its value is inbox task
			repeat with oTask in lstTask
				tell oTask to set {its repetition rule, completed} to {missing value, true}
			end repeat
		end tell
	end tell
end tell