Thank you both for your answers.
Be that as it may, I'd prefer to see every field "fluid" just to be sure; in order to do so, I found that the "Debug mode" box seems to do the trick with the following steps:
1) Load game on FM, open FMRTE and load game on FMRTE
2) Load the tactic in all the three slots and select the (right) players
3) Take every field of match preparation up to 100 on FMRTE
4) Go forward in time staying in the tactics menu (with both teams, in this case scenario)
5) Load game on FMRTE and once again take every field of match preparation up to 100
This way you'll have everything set in a single day of game time.
The only exception seems to be the "Position/role/duty" field, which I believe to be depending on the team's players. That field appears to be at the same level even after a year (spent on holiday for the tests, of course).