Scouts and time series

Now we have the following issue:

We analyzed our data using BEM model, but for the scouts we would like to switch to volumetric model to extract activity from hippocampus and other deep structures. So we recomputed it and tried to create scouts time series. But the BS gives us the following error message (apparently, it still uses the BEM model and there is the conflict between BEM and volume).

scrnsht1

Is there any way to solve this without interfering with the previous analysis done on BEM?