cumulative sum by day in bar chart

[JuanGuti_Taligent]

i want to show in a bar chart  the cumulative sum of invetory day by day in a specific month, 

if i use the following expression 

rangesum(
above(
sum(
{1
<FECHA={"<=$(=max(FECHA))"}
,AÑO_MES = {$(=max(AÑO_MES))}
>}
CANTIDAD_FINAL)
,0, ))

it sums months by months but it doesn't consider the previous month and i need to considera the whole cumulative but consulting month by month in the bar chart