Users can only see bookings for their events on the bookings admin screen unless they have permission to 'manage_others_eo_bookings'

restrict-admin-bookings.php

<?php
/**
 * Plugin Name: Event Organiser Pro - Owner's Bookings Only
 * Plugin URI: http://www.wp-event-organiser.com
 * Version: 0.1.0
 * Description: Users can only see bookings for their events on the bookings admin screen unless they have permission to 'manage_others_eo_bookings'
 *
*/
add_action( 'pre_get_posts', function ( $query ) {
  if( is_admin() && 'eo_booking' == $query->get( 'post_type' ) ){
		$query->set( 'suppress_filters', false );
	}
}, 10, 1 );


add_filter( 'posts_clauses', function ( $clauses, $query ) {

	global $wpdb;

	$organiser = get_current_user_id();
	if( current_user_can( 'manage_others_eo_bookings' ) || !$organiser || 'eo_booking' != $query->get( 'post_type' ) ){
		return $clauses;
	}

	//Check which screen we're on
	$screen = get_current_screen();
	if( !is_admin() || ( $screen && 'event_page_bookings' != $screen->id ) ){
		return $clauses;
	}	

	$postalias     = "{$wpdb->posts}eo";
	$postmetaalias = "{$wpdb->postmeta}eo";

	$clauses['join'] .= "INNER JOIN {$wpdb->postmeta} AS {$postmetaalias}
						ON {$wpdb->posts}.ID = {$postmetaalias}.post_id
						INNER JOIN {$wpdb->posts} AS {$postalias}
						ON {$postalias}.ID = {$postmetaalias}.meta_value";

	$clauses['where'] .= $wpdb->prepare(
		" AND {$postmetaalias}.meta_key = '_eo_booking_event_id'
		AND {$postalias}.post_author = %d",
		$organiser
	);

	return $clauses;
	
}, 10, 2 );