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<?php

add_filter( 'ywraq_order_metabox', 'ywraq_override_shipping_off' );

function ywraq_override_shipping_off( $fields ) {

 if ( isset( $fields['ywraq_disable_shipping_method'] ) ) {

 $fields['ywraq_disable_shipping_method']['std'] = 'no';

 }

 return $fields;

}