Filtering data based on dynamic segmentations (measure)

Hello guys, first of all sorry for my English, I will try to explain what I want to achieve the best I can.
Not sure the Subject is very clear...

I reduced my model so I can show you easily what is my problem:

The user wants to see points of sale segmented dynamically based on two characteristics, number of orders (inside a period of time) and date of the last order. The user has a date slicer whitch filters de maximum calendar date and then it calculates for each Pont of sale its Segment (A,B,C,D...)

To do that I created this measures (code at the end):

Período:
Based on calendar dates
Período 0 = Current month until max date
Período 1 = Current month -1
Período 2 = Current month -2
Período 3 = Dates between Current month -3 and Current month -6

Number of POS with new orders = 
CALCULATE (
    COUNTROWS (
        FILTER(
            ADDCOLUMNS(
                GROUPBY('Point of sale','Point of sale'[NIF]),
                "Pedidos", CALCULATE(DISTINCTCOUNT('Order sale'[Sales order]), FILTER('Calendar',[Período]="Período 0"))
            ),[Pedidos]>0
        )
    )
)

Number of POS with new orders - A = 
CALCULATE(
    [Number of POS with new orders], FILTER('Point of sale','Point of sale'[Segmento POS]="A")
)

Then here you can see the results, as I say everything seems to work ok except when I using sales order (order ID). I guess it has to do with distinct counting those Order Sale (ID) to segment the POS but I can't find the answer...

Edit: I can't use Date either, so it's getting obvious the problem is because I'm doing something wrong with the dynamic segmentation, but I don't know what.

Dynamic measures:

Período = 
VAR inicio_periodo_0 = 
DATE(
    YEAR(CALCULATE(MAX(Calendar[Date]), ALLSELECTED('Calendar'))),
    MONTH(CALCULATE(MAX(Calendar[Date]), ALLSELECTED('Calendar'))),
    1
)

VAR final_periodo_0 = 
CALCULATE(
    MAX(Calendar[Date]), 
    ALLSELECTED('Calendar')
)

VAR inicio_periodo_1 =
DATE(
    YEAR(CALCULATE(MAX(Calendar[Date]), ALLSELECTED('Calendar'))),
    MONTH(CALCULATE(MAX(Calendar[Date]), ALLSELECTED('Calendar')))-1,
    1
)

VAR final_periodo_1 =
EOMONTH(
    CALCULATE(
    MAX(Calendar[Date]), 
    ALLSELECTED('Calendar')),
    -1
)

VAR inicio_periodo_2 =
DATE(
    YEAR(CALCULATE(MAX(Calendar[Date]), ALLSELECTED('Calendar'))),
    MONTH(CALCULATE(MAX(Calendar[Date]), ALLSELECTED('Calendar')))-2,
    1
)

VAR final_periodo_2 =
EOMONTH(
    CALCULATE(
    MAX(Calendar[Date]), 
    ALLSELECTED('Calendar')),
    -2
)

VAR inicio_periodo_3 =
DATE(
    YEAR(CALCULATE(MAX(Calendar[Date]), ALLSELECTED('Calendar'))),
    MONTH(CALCULATE(MAX(Calendar[Date]), ALLSELECTED('Calendar')))-6,
    1
)

VAR final_periodo_3 =
EOMONTH(
    CALCULATE(
    MAX(Calendar[Date]), 
    ALLSELECTED('Calendar')),
    -3
)

RETURN

IF(
    SELECTEDVALUE(Calendar[Date], BLANK())>=inicio_periodo_0 && SELECTEDVALUE(Calendar[Date], BLANK())<=final_periodo_0,
    "Período 0",
    IF(
        SELECTEDVALUE(Calendar[Date], BLANK())>=inicio_periodo_1 && SELECTEDVALUE(Calendar[Date], BLANK())<=final_periodo_1,
        "Período 1",
        IF(
            SELECTEDVALUE(Calendar[Date], BLANK())>=inicio_periodo_2 && SELECTEDVALUE(Calendar[Date], BLANK())<=final_periodo_2,
            "Período 2",
            IF(
                SELECTEDVALUE(Calendar[Date], BLANK())>=inicio_periodo_3 && SELECTEDVALUE(Calendar[Date], BLANK())<=final_periodo_3,
                "Período 3",
                BLANK()
            )
        )
    )
)

Segmento POS = 
VAR pedidos_periodo_1 = CALCULATE(DISTINCTCOUNT('Order sale'[Sales order]), FILTER('Calendar',[Período]="Período 1"))
VAR pedidos_periodo_2 = CALCULATE(DISTINCTCOUNT('Order sale'[Sales order]), FILTER('Calendar',[Período]="Período 2"))
VAR pedidos_periodo_3 = CALCULATE(DISTINCTCOUNT('Order sale'[Sales order]), FILTER('Calendar',[Período]="Período 3"))

RETURN
IF(pedidos_periodo_1=1, "G",
    IF(pedidos_periodo_1=2, "D",
        IF(pedidos_periodo_1>2, "A",
            IF(pedidos_periodo_2=1, "H",
                IF(pedidos_periodo_2=2, "E",
                    IF(pedidos_periodo_2>2, "B",
                        IF(pedidos_periodo_3=1, "I",
                            IF(pedidos_periodo_3=2, "F",
                                IF(pedidos_periodo_3>2, "C", BLANK()
                                )
                            )
                        )
                    )
                )
            )
        )
    )
)

There are for sure easier solutions but I coulnd't find them. I hope I made myself clear and you can understand what I'm trying to do and what my problem is.

Thank you!!!

If you need it I can prepare a PBIX with sample data and everything.


Edit:
I thinl everything works fine now changing the measure that calcultes the segmentation of each POS, added ALL(Orders[ID ORDER])

Segmento farmacia = 
VAR pedidos_periodo_1 = CALCULATE(DISTINCTCOUNT(Pedidos[No. Orden]), ALL(Pedidos[No. Orden]), FILTER(Calendario,[Período]="Período 1"))
VAR pedidos_periodo_2 = CALCULATE(DISTINCTCOUNT(Pedidos[No. Orden]), ALL(Pedidos[No. Orden]), FILTER(Calendario,[Período]="Período 2"))
VAR pedidos_periodo_3 = CALCULATE(DISTINCTCOUNT(Pedidos[No. Orden]), ALL(Pedidos[No. Orden]), FILTER(Calendario,[Período]="Período 3"))