Tengo problemas para obtener el código que encontré para que una pista de auditoría funcione con subformularios. El código original es dehttp://www.fontstuff.com/access/acctut21.htm. Prefiero seguir con este código que usar el código de Allen Brownehttp://allenbrowne.com/appaudit.html. Parece ser un problema conScreen.ActiveForm.Controls. He leído que esto no funciona con subformularios. ¿Hay alguna forma de alterar esto para auditar un subformulario en mi base de datos?

Cuando registro los datos en el formulario secundario, aparece el siguiente error: Microsoft no puede encontrar el campo "CalSubID" mencionado en su expresión ".

En un módulo tengo este código (esto es solo parte de él que creo que tiene problemas):

Sub AuditChanges(IDField As String, UserAction As String)
On Error GoTo AuditChanges_Err
Dim cnn As ADODB.Connection
Dim rst As ADODB.Recordset
Dim ctl As Control
Dim datTimeCheck As Date
Dim strUserID As String
Set cnn = CurrentProject.Connection
Set rst = New ADODB.Recordset
rst.Open "SELECT * FROM tblAuditTrail", cnn, adOpenDynamic, adLockOptimistic
datTimeCheck = Now()
strUserID = Forms!Login!cboUser.Column(1)
Select Case UserAction
    Case "EDIT"
        For Each ctl In Screen.ActiveForm.Controls
            If ctl.Tag = "Audit" Then
                If Nz(ctl.Value) <> Nz(ctl.OldValue) Then
                    With rst
                        .AddNew
                        ![DateTime] = datTimeCheck
                        ![UserName] = strUserID
                        ![FormName] = Screen.ActiveForm.Name
                        ![Action] = UserAction
                        ![RecordID] = Screen.ActiveForm.Controls(IDField).Value
                        ![FieldName] = ctl.ControlSource
                        ![OldValue] = ctl.OldValue
                        ![NewValue] = ctl.Value
                        .Update
                    End With
                End If
            End If
        Next ctl
    Case Else
        With rst
            .AddNew
            ![DateTime] = datTimeCheck
            ![UserName] = strUserID
            ![FormName] = Screen.ActiveForm.Name
            ![Action] = UserAction
            ![RecordID] = Screen.ActiveForm.Controls(IDField).Value
            .Update
        End With
End Select
AuditChanges_Exit:
On Error Resume Next
rst.Close
cnn.Close
Set rst = Nothing
Set cnn = Nothing
Exit Sub
AuditChanges_Err:
MsgBox Err.Description, vbCritical, "ERROR!"
Resume AuditChanges_Exit
End Sub

Luego, en mis eventos "before update" y "AfterDelConfirm" para el subformulario que tengo (donde "CalSubID" es la PK para el subformulario y esto es lo que usa el código del módulo principal para rastrear los cambios):

-----------------------------------------------------------------------
Private Sub Form_BeforeUpdate(Cancel As Integer)
If Me.NewRecord Then
    Call AuditChanges("CalSubID", "NEW")
Else
    Call AuditChanges("CalSubID", "EDIT")
End If
End Sub
-----------------------------------------------------------------------
Private Sub Form_AfterDelConfirm(Status As Integer)
If Status = acDeleteOK Then Call AuditChanges("CalSubID", "DELETE")
End Sub
-----------------------------------------------------------------------

Código modificado:

Sub AuditChanges(IDField As String, UserAction As String)
On Error GoTo AuditChanges_Err
Dim cnn As ADODB.Connection
Dim rst As ADODB.Recordset
Dim ctl As Control
Dim datTimeCheck As Date
Dim strUserID As String

'added code
Dim SubFormName As String

Set cnn = CurrentProject.Connection
Set rst = New ADODB.Recordset
rst.Open "SELECT * FROM tblAuditTrail", cnn, adOpenDynamic, adLockOptimistic
datTimeCheck = Now()
strUserID = Forms!Login!cboUser.Column(1)

'msgbox to display name (just for now to test code)
MsgBox (" " & Screen.ActiveForm.Name & " ")

'IF THEN statement to check if user is using form with subform
If Screen.ActiveForm.Name = "Cal Form" Then
SubFormName = "Cal Form Sub"

    Select Case UserAction
    Case "EDIT"
        For Each ctl In Screen.ActiveForm
            If ctl.ControlType = acSubform Then
            SubFormName = ctl.Name
            If ctl.Tag = "Audit" Then
                If Nz(ctl.Value) <> Nz(ctl.OldValue) Then
                    With rst
                        .AddNew
                        ![DateTime] = datTimeCheck
                        ![UserName] = strUserID
                        ![FormName] = SubFormName
                        ![Action] = UserAction
                        ![RecordID] = Forms![Screen.ActiveForm.Name]![SubFormName].Form![IDField].Value
                        ![FieldName] = ctl.ControlSource
                        ![OldValue] = ctl.OldValue
                        ![NewValue] = ctl.Value
                        .Update
                    End With
                End If
            End If
'Getting error message at the --Next ctl-- line below, "next without for" message....
        Next ctl
    Case Else
        With rst
            .AddNew
            ![DateTime] = datTimeCheck
            ![UserName] = strUserID
            ![FormName] = SubFormName
            ![Action] = UserAction
            ![RecordID] = Forms![Screen.ActiveForm.Name]![SubFormName].Form![IDField].Value
            .Update
        End With
        Set ctl = Nothing
End Select

Else

Select Case UserAction
    Case "EDIT"
        For Each ctl In Screen.ActiveForm.Controls
            If ctl.Tag = "Audit" Then
                If Nz(ctl.Value) <> Nz(ctl.OldValue) Then
                    With rst
                        .AddNew
                        ![DateTime] = datTimeCheck
                        ![UserName] = strUserID
                        ![FormName] = Screen.ActiveForm.Name
                        ![Action] = UserAction
                        ![RecordID] = Screen.ActiveForm.Controls(IDField).Value
                        ![FieldName] = ctl.ControlSource
                        ![OldValue] = ctl.OldValue
                        ![NewValue] = ctl.Value
                        .Update
                    End With
                End If
            End If
        Next ctl
    Case Else
        With rst
            .AddNew
            ![DateTime] = datTimeCheck
            ![UserName] = strUserID
            ![FormName] = Screen.ActiveForm.Name
            ![Action] = UserAction
            ![RecordID] = Screen.ActiveForm.Controls(IDField).Value
            .Update
        End With
End Select


AuditChanges_Exit:
On Error Resume Next
rst.Close
cnn.Close
Set rst = Nothing
Set cnn = Nothing
Exit Sub
AuditChanges_Err:
MsgBox Err.Description, vbCritical, "ERROR!"
Resume AuditChanges_Exit
End Sub