We are working on Enterprise Edition support. Right now we don't support 100% Enterprise version of Magento at this moment. But you can use a lot of features from this version in PRO Edition.
Please take into account - Magento 1.8 is not production version.
According to Magento :
http://www.magentocommerce.com/knowledge-base/entry/ce-18-later-release-notes
"Important: This is an alpha release. Deploy this release in a development or testing environment only. Do not deploy this release into production."
We know about this problem. This feature will be implemented after stable production release of Magento.