Error stopping a Business Rule from Running

CRM 2013 UR2

2 CRM fields, telephone1 (telephone number) and new_invalidphonenumber (optionset 1,0)

We have a business rule which shows an error on the telephone1 field if the new_invalidphonenumber field = 1, this works fine, I now want to set the new_invalidphonenumber field to 0 upon change of the telephone1 field which we are doing through javascript with this simple bit of code

function SetInvalidPhoneNumberOff() {

    var value = '0';
        Xrm.Page.getAttribute("new_invalidphonenumber").setValue(parseInt(value));
        Xrm.Page.getAttribute("new_invalidphonenumber").setSubmitMode("always");
        Xrm.Page.getAttribute("telephone1").setSubmitMode("always");

}

We can see the new_invalidphonenumber field changing to 0, but the Business Rule still highlights Telephone1 as an error. If we manually change new_invalidphonenumber to 0 then the Business Rule error is cleared as expected, why does it clear when javascript updates the field? is there a way to do this?

Pete