qb pro and ent on the same server win 2003 + citrix

I have running Windows 2003 with installed on QuickBook 2008
enterprise and QuickBook 2008 proffesional. Both application are
published on Citrix. The problem is fact that user can't open both
versions simultaneously. I heard form technical support that it can't
be done. They suggest to install qb 2008 and qb 2007 instead of our
solution.

If it's possible to make it run ?


I attach details :

- qb ent 2008 :

working line :

"C:\Program Files\Intuit\QuickBooks Enterprise Solutions
8.0\QBW32EnterpriseProfessional.exe"

working direcory :

c:\program files\intuit\quickbooks enterprise solutions 8.0\QB08 - data
\

- qb pro 2008


working line :

"c:\program files\intuit\QuickBooks 2008\QBW32Pro.exe"

The problem is fact that any worker can't run

working direcory :

c:\program files\intuit\QuickBooks 2008