Invisible field does not work during the registration

[Puoti]

Who can help me I have a problem I created custom fields in the purchasing and I have made ​​read-only and I checked the box that says not to show while recording, but this is not the case the fields are read-only but visible. How can I solve this problem please?
Thanks to everyone who help me

[jenkinhill]

http://forum.virtuemart.net/index.php?topic=79799.0

[Puoti]

Thanks for the answer to this is the information you requested:

VirtueMart 2.0.18f
Joomla! 2.5.9 Stable
Version PHP 5.3.15