On this update page you should not be specifying the id column to have a value, it should only be referenced on step one where you specify the index field and the value for it. You do not need to set a value for this in the update itself.
Looking at the query that you have it seems that you do not have a default value for the WADAUpdateRecordID field in your form. You need to select this form element and bind the id from your recordset.