SAP B1 UnBind User Data Source pulls in wrong Data

Hi,

I am Unbinding this edittext (box1) like so:

 If combo2.Selected.Value = "Date" Then
                box2.DataBind.SetBound(True, "", "udsDate2")
Else
                box2.DataBind.UnBind()
 End If

However, when this code fires, the EditText pulls in Data From another field on the form (a comboBox)

Any idea why this is happening?

The combo is bound to a totally different uds...

many thanks