Commerce: Required product SKU is missing

I searched a lot, but did not find a solution, import preview works fine (attached picture), SKU is mapped, but actual import does not import anything, ends with "Required product SKU is missing.", Drupal 7 in latest version, feeds 7.x-2.0-beta4 (tried 7.x-2.0-beta5 and latest dev and not working as well) It was working before. PHP 7.2

CSV done on Mac Numbers, checked in COda and BBEdit, looks fine.

Many thanks for help!

Exported feed config

$feeds_importer = new stdClass();
$feeds_importer->disabled = FALSE; /* Edit this to true to make a default feeds_importer disabled initially */
$feeds_importer->api_version = 1;
$feeds_importer->id = 'importer_produktu_s_velikosti';
$feeds_importer->config = array(
  'content_type' => '',
  'description' => '',
  'expire_period' => 3600,
  'fetcher' => array(
    'config' => array(
      'allowed_extensions' => 'txt csv tsv xml opml',
      'allowed_schemes' => array(
        'public' => 'public',
      ),
      'delete_uploaded_file' => 0,
      'direct' => 0,
      'directory' => 'public://feeds',
    ),
    'plugin_key' => 'FeedsFileFetcher',
  ),
  'import_on_create' => 1,
  'import_period' => '-1',
  'name' => 'Importer produktu',
  'parser' => array(
    'config' => array(
      'delimiter' => ';',
      'encoding' => 'UTF-8',
      'no_headers' => 0,
    ),
    'plugin_key' => 'FeedsCSVParser',
  ),
  'process_in_background' => 0,
  'processor' => array(
    'config' => array(
      'author' => '1',
      'bundle' => 'produkt',
      'input_format' => 'plain_text',
      'insert_new' => '1',
      'language' => 'und',
      'mappings' => array(
        0 => array(
          'language' => 'und',
          'source' => 'SKU',
          'target' => 'sku',
          'unique' => 1,
        ),
        1 => array(
          'language' => 'und',
          'source' => 'Title',
          'target' => 'title',
          'unique' => FALSE,
        ),
        2 => array(
          'language' => 'und',
          'source' => 'Price',
          'target' => 'commerce_price:amount',
          'unique' => FALSE,
        ),
        3 => array(
          'language' => 'und',
          'source' => 'Foto1 URL',
          'target' => 'field_foto1:uri',
          'unique' => FALSE,
        ),
        4 => array(
          'language' => 'und',
          'source' => 'Foto1 ALT',
          'target' => 'field_foto1:alt',
          'unique' => FALSE,
        ),
        5 => array(
          'source' => 'Foto1 Nadpis',
          'target' => 'field_foto1:title',
          'unique' => FALSE,
        ),
      ),
      'product_type' => 'produkt',
      'skip_hash_check' => 0,
      'tax_rate' => TRUE,
      'update_existing' => '1',
      'update_non_existent' => 'skip',
    ),
    'plugin_key' => 'FeedsCommerceProductProcessor',
  ),
  'update' => 0,
);

Many thanks