Hello Boris,
The
"Fully Qualified Domain Name" consists of two parts: the hostname and the domain name. The [ComputerName] property is the computer name of the current system. The installer sets this property by a system call to "GetComputerName". In this case, the [ComputerName] property is only representing the hostname.
Unfortunately, there isn't any property which stores the FQDN.
In order to get the FQDN and save its value in a property, you can create a PowerShell script as it follows:
$myFQDN=(Get-WmiObject win32_computersystem).DNSHostName+"."+(Get-WmiObject win32_computersystem).Domain
AI_SetMsiProperty YOUR_PROPERTY $myFQDN
The above script will set the "YOUR_PROPERTY" property to the $myFQDN variable value (which is the FQDN)
Hope this helps.
All the best,
Catalin