Hi,
While I was working on the Custom Field, I had to overwrite the product administration layouts, but it was impossible to do so.
The template layouts are not called (i.e administrator/templates/bluestork/html/com_virtuemart/product/product_edit_custom.php)
I located the bug in the product view at line 55 :
File : administrator/components/com_virtuemart/views/product/view.html.php
The ligne 55 should be commented to allow Jommla to use the template layouts
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VM 2.0.2 on Joomla 2.5.3