Combining 2 tables, editing only the second table

Hello!
I've been suffering for two days and I'm asking for help.

I have two tables:
Table 1: "aaa_kv":
- id
- kv_num

Table 2: "aaa_fio":
- id
- kv_id
- fio_name

They are connected like this:
aaa_kv.id = aaa_fio. kv_id
Table 1 "aaa_kv" - should not be changed, and in Table 2 "aaa_fio" records can be added, edited and deleted.
Unfortunately, I did not find a suitable example for my case.

So I connected two tables using "join" and specially (for test purposes) output all the fields:
http://www.a0250268.xsph.ru/index.php
The output works fine, but how to make an edit (+add, + delete)?

Here I tried "Mjoin" - it does not work:
http://www.a0250268.xsph.ru/index.php/kv-mjoin

Here is the code with "join":

(function($){
$(document).ready(function() {
    var editor = new $.fn.dataTable.Editor( {
        ajax: '/abc_crm/dt/my/kv/kv.php',
        table: '#aaa_kv',
        fields: [
            {
                label: "fio_name:",
                name: "aaa_fio.fio_name"
            }
        ]
    } );

    var table = $('#aaa_kv').DataTable( {
        dom: 'Bfrtip',
        ajax: '/abc_crm/dt/my/kv/kv.php',
        columns: [
            {data: "aaa_kv.id"},
            {data: "aaa_kv.kv_num"},
            {data: "aaa_fio.id"},
            {data: "aaa_fio.kv_id"},
            {data: "aaa_fio.fio_name"}
        ],
        select: true,
        lengthChange: false,
        buttons: [
            { extend: 'create', editor: editor },
            { extend: 'edit',   editor: editor },
            { extend: 'remove', editor: editor }
        ]
    } );
} );

}(jQuery));

<?php
// DataTables PHP library and database connection
include( "../../prog/php/lib/DataTables.php" );

// Alias Editor classes so they are easy to use
use
    DataTables\Editor,
    DataTables\Editor\Field,
    DataTables\Editor\Format,
    DataTables\Editor\Mjoin,
    DataTables\Editor\Options,
    DataTables\Editor\Upload,
    DataTables\Editor\Validate,
    DataTables\Editor\ValidateOptions;

// Build our Editor instance and process the data coming from _POST
Editor::inst( $db, 'aaa_kv', 'id' )
    ->fields(
        Field::inst( 'aaa_kv.id' ),
        Field::inst( 'aaa_kv.kv_num' ),
        Field::inst( 'aaa_fio.id' ),
        Field::inst( 'aaa_fio.kv_id' ),
        Field::inst( 'aaa_fio.fio_name' )
    )
    ->leftJoin( 'aaa_fio', 'aaa_fio.kv_id', '=', 'aaa_kv.id' )
    ->process( $_POST )
    ->json();