NO
Assuming your subform control is actually called subform....
Code:
Dim strText As String
strText=Me.subForm.check_out_detail.Form.SHIPMENT NO
DoCmd.OpenReport strText, acViewPreview
You don't need the acNormal as its the default
OR to filter by a specific field and filter criteria, something like
Code:
DoCmd.OpenReport strText, acViewPreview, , "FieldName='" & FilterCriteria & "'"
HTH