Cumulative sum with gaps in axis

Hello all,

I am working with cumultavies over time but instead of months I am calculating cumulatives based on  diffrence of two months [Completion_Vs_Contract] this is as well in my axis however I have there some gaps and cumulative might go down in gap months.

For example my monhts are -12 -11 -10 -9 -8 -6 -3 -2 -1 0 1 2 3

Is there way of taking this gaps into conisderation?

Vintage Cumulative =
CALCULATE (
    [Settlements],
    FILTER (
        ALL (
            Terminations[Completion_Vs_Contract]
        ),
        Terminations[Completion_Vs_Contract] <= MAX ( Terminations[Completion_Vs_Contract] )
    )
)

Many thanks.

Andrej