Arquivo que altera o BD

mysql4-install-0.1.1.php

<?php

$installer = $this;

$installer->startSetup();

$setup = Mage::getModel('customer/entity_setup', 'core_setup');
$setup->addAttribute('customer', 'tipopessoa', array(
	'type' => 'int',
	'input' => 'select',
	'label' => 'Tipo Pessoa',
	'global' => 1,
	'visible' => 1,
	'required' => 0,
	'user_defined' => 1,
	'default' => '0',
	'visible_on_front' => 1,
    'source' =>	 'novoatributo/entity_tipopessoa',
));

if (version_compare(Mage::getVersion(), '1.4.2', '>='))
{
	Mage::getSingleton('eav/config')
	->getAttribute('customer', 'tipopessoa')
	->setData('used_in_forms', array('adminhtml_customer','customer_account_create','customer_account_edit','checkout_register'))
	->save();
}

$tablequote = $this->getTable('sales/quote');
$installer->run("
ALTER TABLE  $tablequote ADD  `customer_tipopessoa` INT NOT NULL
");

$installer->endSetup(); 

$installer = $this;
$installer->startSetup();
$setup = Mage::getModel('customer/entity_setup', 'core_setup');
$setup->addAttribute('customer', 'rg', array(
	'type' => 'text',
	'input' => 'text',
	'label' => 'Identidade (RG)',
	'global' => 1,
	'visible' => 1,
	'required' => 0,
	'user_defined' => 1,
	'default' => '0',
	'visible_on_front' => 1,
));

if (version_compare(Mage::getVersion(), '1.4.2', '>='))
{
	Mage::getSingleton('eav/config')
	->getAttribute('customer', 'rg')
	->setData('used_in_forms', array('adminhtml_customer','customer_account_create','customer_account_edit','checkout_register'))
	->save();
}

$tablequote = $this->getTable('sales/quote');
$installer->run("
ALTER TABLE  $tablequote ADD  `customer_tipopessoa` INT NOT NULL
");

$installer->endSetup();