DVC has to track the dedicated/lockoff assignments on each reservation in order to properly monitor inventory. If inventory is showing a vacant lockoff studio and lockoff 1B in the same category, they can then book a member in a two bedroom villa using both rooms. But if it's a lockoff 1B and a dedicated studio, the 2B booking won't work.
The lockoff/dedicated designations have never consistently appeared on paper conformations or the website, but they are flagged appropriately in the computers.
HOWEVER, the "X" factor to all of this is what happens at the front desk. CMs don't always seem to appreciate the distinction. We most frequently hear about this at BCV where lockoff / dedicated / dedicated with 2 queen beds are three distinct room types. And most guests expect to get exactly what they booked--particularly if it's the 2Q room.
So MS should know whether a member has a lockoff or dedicated reservation. But the front desk can still be inconsistent at assigning rooms.