sum calculated field from subform datasheet

hockey8837

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Hi,
I'm trying to sum a couple of columns from a subform datasheet and carry them onto the main form.

My main form, [frm_tours_details], holds subform [sbfTours] which is a datasheet.

On [sbfTours], I've got a couple calculated fields within the datasheet, one, called "txtStudentSum", which calculates number of people total ([students]+[adults]+[numfreeteachers]) and one, called "txtptotal", which calculates fee for the program based on the following formula:

Code:
=IIf([txtMonth]>=10 Or [txtMonth]<=4,([Students]+[Adults])*7,([Students]+[Adults])*8)
(The fee is $8/person in season, and $7/person out of season.)

I've been following online directions I found to put a text box in the form footer which then sums each of these calculated fields ("txtStudentSum" & "txtptotal"), and then reference these text boxes from my main form.

However, the main form text boxes just come up as #Name? or #Error when I try to reference these boxes on the subform. Or, sometimes, the one calculating total students will show the total of ALL students, adults in the database, not just those for this particular record-but only, it seems, if I have the subform open separately first, then load the main form. I also tried putting the whole original calculations into text boxes on the main form, but they will only reflect either the current record selected in the subform, or they will only show the first record, regardless of what you've selected, depending on which way I tried.

I've attached a copy of the database for ease of helping... click on the tab 'tours', then click on, say, tour #6 (since this one is multiple programs and needs to calculate) to open the tour details form.
 

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