RPAS Fusion Client (version: 15.0.1.18), Promotion Effectiveness Step

At "Promotion Effectiveness" Step (Promote Activity Group), I am able to enter a value at "Promotional Lift Override" (at "Causal Promotion Forecast Override" Step) even though I do not have a promotion marked at "Promotions" (at "Promotional Calendar" Task) at the corresponding date (in future). The "Promotional Lift Override" (at "Causal Promotion Forecast") holds the value. Is this correct?

When I mark a promotion,on a particular date (in future), at "Promotions" (at "Promotional Calendar" Task), then I navigate to "Causal Promotion Parameters", I modify the value of "System effect Override promotion" , I modify "Promo Effect Type" to "Override Future only" and check "Apply Promotional Lift Override". Then I click Calculate and I navigate to "Causal Promotion Forecast", to the corresponding date and I do not observe any change at the corresponding date. Is this correct? Should this be happening?