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This is a modified/simplified Scriptlibrary(SimpleScript) Interaction which when you specify a Quest, as one of the options allows you to Restart re(ACCEPT) that quest, or abandon it (MAYBE). There is one issue that can occur. If a user has Completed the quest, using this script and hitting (MAYBE) leaves it completed. To Un-Complete, you must re(ACCEPT) and then click again and hit Maybe. At that point your original quest-giver should then be back to offering the quest again. To see how it work's hop on my TestRoof world to give the Shopping quest a spin and test the script.
V2 - Added additional cleanup of Objectives to properly handle N / M Objectives.