This article was previously published under Q208998
This article has been archived. It is offered "as is" and will no longer be updated.
Moderate: Requires basic macro, coding, and interoperability skills.
This article shows you how to reference a subtotal control on a subform from a main form.
If you try to sum a subform field by using a calculated control on a mainform, you may receive an error message in the main form control. Forexample, the following expression in a main form control generates a"#Name?" error message:
To avoid an error, you can sum the subform field by using a calculatedcontrol in the subform's form footer. You can then reference thecalculated control from the main form to display the summed value.
There's an example of this method in the Orders form of the Northwind sample database. First, a calculated control in the footer of the Orders Subform sums the subform's Extended Price field to create a subtotal. It uses the following syntax:
Text Box Control ---------------- Name: OrderSubtotal ControlSource: =Sum([ExtendedPrice])
Because the subform's DefaultView property is set to Datasheet, you do not see the calculated control in the subform's form footer when you open the Orders form in Form view. However, a text box control on the main Orders form refers to the subform's calculated control and gets its value to display. The main form control is called Subtotal and references the subform's calculated control. It uses the following syntax:
Text Box Control ---------------- Name: Subtotal ControlSource: =[Orders Subform].[Form]![OrderSubtotal]
This reference allows the main form to display a subtotal of a subformcontrol while the actual totaling of subform values is performed by using acalculated control in the subform's form footer.
For more information about referencing subform controls, click Microsoft Access Help on the Help menu, type calculating a total in a subform in the Office Assistant or the Answer Wizard, and then click Search to view the topic.