remove required field from opencart 2 admin edit order

Hi guys, my question: How delete required fields(like lastname,phone) in admin/ sale/ edit order ?

Hello,
I have the same problem. Does somebody know how to do that?

Thank you very much.

in admin/view/sale/order_form.tpl
first: delete required
<div class="form-group" required>// <<<<
<label class="col-sm-2 control-label" for="input-lastname"><?php echo $entry_lastname; ?></label>
<div class="col-sm-10">
<input type="text" name="lastname" value="<?php echo $lastname; ?>" id="input-lastname" class="form-control" />
</div>
then (inelegant): coment or delete if option in $('#button-customer').on('click', function()
success: function(json) {
$('.alert, .text-danger').remove();
$('.form-group').removeClass('has-error');
/*
if (json['error']) {
if (json['error']['warning']) {
$('#content > .container-fluid').prepend('<div class="alert alert-danger"><i class="fa fa-exclamation-circle"></i> ' + json['error']['warning'] + ' <button type="button" class="close" data-dismiss="alert">&times;</button></div>');
}

for (i in json['error']) {
var element = $('#input-' + i.replace('_', '-'));

if (element.parent().hasClass('input-group')) {
$(element).parent().after('<div class="text-danger">' + json['error'] + '</div>');
} else {
$(element).after('<div class="text-danger">' + json['error'] + '</div>');
}
}

// Highlight any found errors
$('.text-danger').parentsUntil('.form-group').parent().addClass('has-error');
} else {*/
at end...
request_2.done(function() {
$('#button-refresh').trigger('click');

$('a[href=\'#tab-cart\']').tab('show');
});
/*}*/ <<<<<<<<<
},
error: function(xhr, ajaxOptions, thrownError) {
alert(thrownError + "\r\n" + xhr.statusText + "\r\n" + xhr.responseText);
}
});
});
never check error and the button continue work
hope helpfull