The Match Item question object from the ToolBook catalog which has the option "Cannot change responses" checked on the "Answers" tab, still allows the user to change their response when an incorrect answer is given.
This is a known issue that occurs because the Match Item question object does not fire a "question answered" event unless a correct answer is chosen. In order to work around this problem, limit the number of tries for the question to 1 and have the user click on a delayed feedback button (from the catalog) when they have finished providing their response, and then the entire question will get locked preventing further interaction.
KEYWORDS: matchItem questionWidget 20345 P597
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