require 'netsuite'

ns_inventory_transfer_id = 123

search = NetSuite::Records::InventoryTransfer.search(
  criteria: {
    basic: [
      {
        field: 'type',
        operator: 'anyOf',
        value: %w(_inventoryTransfer)
      },
      {
        field: 'mainLine',
        value: true
      },
      {
        field: 'internalIdNumber',
        operator: 'equalTo',
        value: ns_inventory_transfer_id
      }
    ]
  },

  columns: {
    'tranSales:basic' => {
      'platformCommon:internalId/' => {},
      'platformCommon:customFieldList' => {}
    }
  }
)

search.results.first