Microsoft KB Archive/207755

= ACC2000: Subform Field Linker Builder Error Creating Links =

Article ID: 207755

Article Last Modified on 7/13/2004

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APPLIES TO


 * Microsoft Access 2000 Standard Edition

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This article was previously published under Q207755



This article applies only to a Microsoft Access database (.mdb).

Novice: Requires knowledge of the user interface on single-user computers.



SYMPTOMS
When you click the Subform Field Linker Build button next to the LinkChildFields or LinkMasterFields property of a bound subform property sheet, you may receive the following error message:

Can't build a link between unbound forms.



CAUSE
The linking field for the main form is not bound to a table or query.



RESOLUTION
You must manually create the link between the main form and the subform by typing the field names that you want to use in the LinkChildFields and LinkMasterFields property boxes.



MORE INFORMATION
You will be able to use the Subform Field Linker Builder to link the fields in your main form/subform combination only if the following conditions are true:
 * Both the main form and the child object are based on tables or queries, and a relationship between those objects has been defined with the Relationships command.
 * The main form is based on a table with a primary key, and the subform is based on a table or query that contains a field with the same name and the same or a compatible data type as the primary key.

Steps to Reproduce Behavior
 Open the sample database Northwind.mdb. Create a new form not based on any table or query in Design view, and save the form as Form1. Add a combo box to the form with the name SelectCustomer.  Set the RowSource property of the SelectCustomer combo box to:      Select CustomerID from Customers ORDER BY CustomerID  Close and save Form1.</li> Use the AutoForm: Columnar Wizard to create a new form based on the Orders table. Save the form as Form2, and then close it.</li> Reopen the Form1 form in Design view and position the form so that you can see the Database window. Drag the Form2 form from the Database window to the detail section of the Form1 form.</li> View the properties of the Form2 subform control, click the Data tab, and position the pointer in the LinkMasterFields property box. Click the Build (...) button. Note that you receive the error message mentioned in the "Symptoms" section.</li></ol>

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