It seams the number of saves are limited thro all game and not per single mission.

When I saved multiple saves over one or two missions (scenario) and no more EMPTY SLOT present, it is possible to overwrite the existing saves BUT:

the EMPTY SLOT also wont appear on other missions save window (wasted all slots on other missions) and now if I play this mission (with no saves previously done and no EMPTY SLOT) and I press save button (which is Enabled) the game crashes.

{F33194}