MindBender: Rescind or Amend Something Previously Adopted (Question)

Question:  A motion was made two months ago for an expenditure of funds and passed. At a meeting where the Chairman of the committee was not present, a member made a motion to change the  earlier motion to an amount of funds that was less than the amount  previously adopted. Is this in accordance with the rules?

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That's it, no applicable bylaws. RONR is the Parliamentary Authority.