subform does not update after chosing date in main form

[Patricia]

I have a form that has a combo box with date in it. Based on the date chosen
in the combo box I want the subform to display the data for that date. The
parent/child fields are linked by the date. When you first open the form the
first date in the combo box displays and the data in the subform is correct.
When you change the date the data does not update. What did I miss?

Thanks