“The data has been changed” error when stepping from main form into sub form

Question

I\'m migrating an Access database to SQL Server using the SQL Server Migration Assistant (SSMA). The Access application will continue to be used but with linked tables inst

Answer 1

I solve this problem via writing AfterUpdate form-event like this:

Private Sub Form_BeforeUpdate(Cancel As Integer)
    cSQL = "update UnderlinedTable set Field1=" & Me.Controls("Field1") & _
        ", Field2=" & Me.Controls("Field2") & _ ' and all other fields in your form
        " where PrimaryKey=" & Me.Recordset.Fields("PrimaryKeyField")
    ' here command to SQL server that executes this cSQL string
    Me.Requery
    Cancel = True 'stop Access updating
end sub

It is possible to be wriiten universal BeforeUpdate form-event function that generates automatically Update statement based on form.recordsource and changed form fields that can be invoked from all AfterUpdate form-events passing form as parameter. I have made this for me.

Answer 2

After much trial and error I solved the issue. In the enter event handler for the sub form control on the main form, I requeried the sub form itself.

eg On the main form:

Private Sub Subform1_Enter()
    Me.Subform1.Form.Requery
End Sub

I don't know why this works, only that it does.

Answer 3

This happens when a record is updated in a table, but the record source of the main form has not been refreshed to reflect the change, so Access gets conflicting information and thinks the record has been changed. See also: http://support.microsoft.com/kb/302492