Is it possibile to select a particular Build Forge project snapshot from RTC build definition?

Hi all,
We are using RTC 4.0.6 and BuildForge 7.1.3.2.

In RTC build definition editor:
- Pressing Get Projects from the BuildForge tab only show Build Forge project names, not, eventually, project snapshots.

In Build Forge:
- The Default snapshot is set to the Base Snapshot.

When we request a build from the rtc build definition it seems that a random snapshot is choosen.

We need to select a particular build forge project snapshot from the rtc build definition.
Is it possibile?

Thanks, Alberto