combo box to bring up record in form

I have a combo box with three fields of data from a query, and each field is from a different table. One field is an auto number and the others are text. SrvcLookUp is the combo box and ServiceID is the auto number. I keep getting a Run-time error '3464': Data type mismatch in criteria expression. What am I doing wrong?!
Here is the event procedure:

Private Sub SrvcLookUp_AfterUpdate()
' Find the record that matches the control.
Dim rs As Object

Set rs = Me.Recordset.Clone
rs.FindFirst "ServiceID = '" & Me![SrvcLookUp] & "'"
If Not rs.EOF Then Me.Bookmark = rs.Bookmark
End Sub

Any help would be greatly appreciated...

/Frank

You saod the service ID is a Number so your find first comment is incorrectly reference. Use the following

rs.FindFirst "ServiceID = " & Me![SrvcLookUp]

You can have quotes around a numeric data value

S-