Dear Alfonso and CONN experts
I have encountered a problem implementing my study design in CONN and appreciate your help. 

I have 2 groups of subjects. Group 1 has 4 different sessions (s1, s2, s3, s4) and group 2 has the same 4 sessions but for 2 different time points (s1_t1, s1_t2, s2_t1, s2_t2…).
I want to compare each of the 4 sessions (e.g. s1) of group1 with the corresponding session of group2 at the 2 different time points (that is, to compare s1 with s1_t1 and also to compare s1 with s1_t2), and also for group 2 to compare each session between the 2 different time points (e.g. s1_t1 vs. s1_t2).
To do this, I have uploaded 4 sessions for group 1 and 8 sessions for group 2 (that is the 4 sessions at the 2 different time points) and defined 8 conditions.

Now I have a problem with mapping the 4 sessions of group 1 into the 8 conditions. If I only map them into 4 conditions (and allow missing data), in the group analysis I can’t compare these sessions to both time points of group 2.
I tried to map the 4 sessions into the 8 conditions by mapping each session into 2 conditions (I thought this should work!), but still in the group analysis only 4 conditions seem to have data for group 1, even though according to the settings the other 4 conditions should have the same identical data as the first four. So again I can't compare the sessions of group 1 to both time points of group 2.

I would highly appreciate any help on this.
Many thanks