I\'ve struggling with this problem on my own, then with some help, then search about it; but I haven\'t had any luck. So I decided to ask.
I have two forms in Access
You must use the name of the subform control, not the name of the subform, though these are often the same:
Forms![MainForm]![subform control name Name].Form.Requery
Or, if you are on the main form:
Me.[subform control name Name].Form.Requery
More Info: http://www.mvps.org/access/forms/frm0031.htm