Counting rows respect to the last status assumed

Hi,
I'm analyzing dossier data in a PowerPivot table.
In particular, I've three tables: the Dossier table, the Calendar table (date, week, month, quarter, semester and year) and the Status table for dossier.
In a same day, a dossier can change his status more times (from created to active, from active to closed, and so on): so in the Dossier table I've more dossier occurences with a status date and a sequence column to replace the time. For a new date, the sequence
column restarts to 1.
I need to count the dossier respect to the selected period (a specific date, a specific month, a specific year, and so on) by considering only the dossier with the last status date minor or equal than the selected period.
Fe, for these dossier data:
Dossier id      Status      Status_Date     Sequence
      1            Created    11/02/2015           1
      1            Active       11/02/2015          2
      1            Closed      11/02/2015          3
I must consider the closed dossier row with sequence = 3 when I select '11/02/2015' date from my calendar. The resulting dossier count has to be equal to 1.
I've created this DAX measure:
LAST_DOSSIER_STATUS_NUMBER:=COUNTROWS(
FILTER( VALUES(Dossier[DOSSIER_ID]);
CALCULATE(MAX(DOSSIER[SEQUENCE])) = CALCULATE( MAX(DOSSIER[SEQUENCE]) ; all(dossier[status_id]) ) ) )
It functions only if I select a date, but not if I select the month (february) or the year (2015).
I've tried to use FILTER and LASTDATE functions inside the CALCULATE( MAX(DOSSIER[SEQUENCE]) ; all(dossier[status_id]) ) expression but with no results.
Any helps for me, please? Thanks

Hi Imke,
for a specific day I could have three status change for a specific dossier, and so I could have three same occurence for a dossier: DISTINCTCOUNT(Dossier[DOSSIER_ID]) should return 1, but respect which status? If I should put the STATUS_ID on the rows of
a pivot table I could see 1 for the created status, 1 for the active status and 1 for the closed status. The goal is to show only 1 value for the closed status, that is the last status assumed for the specific dossier.
For the data posted next:
when I select 11/02/2015 as date I've the desired behaviour
but when I select 2015 as year I don't have the wanted behaviour (see dossier_id 1 and dossier_id 4):
The desired behaviour is to see for dossier_id 1 only status_id 4 and not status_id 2, for dossier_id 4 only status_id 4.
As row labels I've dossier_id and status_id, as filter I've a Time Hierarchy (date, month, year) built on a calendar table.
Thanks

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