Calculated field on Access Form

I need to calculate a value in a field in the footer section of a form (e.g. Sum), but need to multiple that value by a number that is in another footer field.  Access keeps giving me an error when I reference the other footer field.  (I'm actually trying to multiply the sum of one of the detailed columns by a percentage that is stored in another footer field).

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DatabaseMX (Joe Anderson - Microsoft Access MVP)Database Architect / Systems AnalystCommented:
Show the calculation that is giving the error ...

What is the specific error?

Here's a good primer on how to reference conmtrols between forms/subform.

tpigielskiAuthor Commented:
This is the calc giving the error:

=Sum(([Quantity On Hand]*[UnitPrice])*(1-[txtDiscount]))

Quantity On Hand and UnitPrice are in the Detail section of the form.  txtDiscount is in the footer section of the form.
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What is the error?

Error number?
tpigielskiAuthor Commented:
no error number...just #ERROR in the field when I get out of design view.
In that case it's not understanding something in your formula..

Can you post a screenshot of the form with the error displayed?
Dale FyeOwner, Dev-Soln LLCCommented:
My guess is that [txtDiscount] is the "other field in the Footer of the form, but is this a bound field, or unbound?

Have you tried:

=Sum([Quantity On Hand]*[UnitPrice])*(1-[txtDiscount])


=Sum([Quantity On Hand]*[UnitPrice])*(1-me.txtDiscount)


=Sum([Quantity On Hand]*[UnitPrice])*(1-val(me.txtDiscount))

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DatabaseMX (Joe Anderson - Microsoft Access MVP)Database Architect / Systems AnalystCommented:
As fyed is implying, you cannot user Sum (or other aggregate functions) on Controls, only on bound fields in your form/report.

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