That was the first major dispute of the Convention - whether they were amending or scrapping the Articles. By the end of the first day of Committee of the Whole (May 30, iirc), the Convention agreed that they were scrapping the Articles and creating a new government, as expressed in that day's resolution no. 3, which replaced the Virginia Plan's stated goal of amending the Articles with the following:
That a national government ought to be established, consisting of a supreme judicial, legislative and executive.
'Supreme' was the operative word, as the proposed government would be able to overide any given state's legislative objection.