Profile: tinoU

//Limit the number of reviews for a user on a parent CPT
add_filter('cred_form_validate','my_validation',10,2);
function my_validation($field_data, $form_data)
{
    //field data are field values and errors
    list($fields,$errors)=$field_data;
     
    //uncomment this if you want to print the field values
    //print_r($fields);
     
    //validate if specific form
    if ($form_data['id']==1695)
    {       
            $user = get_current_user_id();
            $shop_id = $_POST['_wpcf_belongs_shop_id'];
            $args = array(
                'meta_key'   => '_wpcf_belongs_shop_id',
                'meta_value' => $shop_id,
                'post_type'  => 'review',
                'author' => get_current_user_id()
            );
            $query = new WP_Query( $args );
            $user_post_count = 0;
            if(isset($query->found_posts)){
                $user_post_count = $query->found_posts;
            }
            $user_data = get_userdata($user);
            $user_role = $user_data->roles;
               
         if ( in_array($user_role[0], array('subscriber', 'author', 'contributor', 'editor')) && $user_post_count > 0)
        {
            //set error message for my_field
            $errors['wpcf-user-validation']='<span><i class="fa fa-star" aria-hidden="true"></i> You have already left a Review!</span>';
        }
    }
    //return result
    return array($fields,$errors);
}