[SL] How to install 2 versions with different datasets on 1 server ?

[Roy P <or...@sh...>]

Morning all !

I want to install version 2.7 alongside version 2.6.
Configuring the 2 installations in different directories with the required 
apache configuration is easy.  But.....

When I try create a test dataset in 2.7, it tells me that the id sequence 
exists. I guess that the id sequence is shared between datasets ?
It there an easy way to have the id sequence be unique to each dataset ?
Or is there something weird with my database configuration ?

Cheers,
Roy P