ACC: Error Updating Field When Adding New Record to Form

MORE INFORMATION

When you create a form based on a query, any control bound to a query field containing an expression is read-only. Because the query expression is not bound to any specific field in the underlying table, you can't edit the values in these fields. However, when you set the DefaultValue property of such a control, Microsoft Access attempts to write a new value to that control every time you add a new record.

Steps to Reproduce Behavior

CAUTION: Following the steps in this example will modify the sample database Northwind.mdb (or NWIND.MDB in version 2.0 or earlier). You may want to back up the Northwind.mdb (or NWIND.MDB) file and perform these steps on a copy of the database.

1. Open the sample database Northwind.mdb (or NWIND.MDB if you are using Microsoft Access version 2.0).
2. Open the Orders Subform form in Design view.
3. Select the Extended Price text box; on the View menu, click Properties and set the DefaultValue property to 0.
4. Close and save the Orders Subform form.
5. Open the Orders form and add a new item to any order.
   
   Note that you receive one of the error messages described in the "Symptoms" section.