The court shall not enter a judgment upon a plea of guilty unless it is satisfied that there is a factual basis for the plea. NOTE: Section 60.70 is identical to the last sentence of former § 995 and former Rule 11. See also § 1.6 set forth in ABA, Project on Minimum Standards for Criminal Justice Pleas of Guilty (Approved draft 1968). See discussion id., at 30-34. See generally 8 Moore, Federal Practice ¶11.03[4](1974).