Summing forward and backwards

[STS_Joshua]

Hi All,

I have a current on hand amount and monthly ins and outs. Here is some sample data:

Date	In	Out	Fin
Aug	6	4
Sep	3	5
Oct	4	5
Nov	5	2
Dec	4	3

Assuming an on hand at the end of september of 10 then I would like a measure that will calculate forward and backwards like so:

Date	In	Out	Fin
Aug	6	4	12
Sep	3	5	10
Oct	4	5	9
Nov	5	2	12
Dec	4	3	13

Thanks!

[FrankAT]

Hi @STS_Joshua 

I don't know where your the start value of 10 is coming from . So I integrated it with the following solution:

Fin = 
CALCULATE(
    [Sum of Value],
    FILTER(
        ALL('Table'),
        'Table'[Index] <= MIN('Table'[Index])
    )
)

Sum of Value = SUM('Table'[In]) - SUM('Table'[Out])

With kind regards from the town where the legend of the 'Pied Piper of Hamelin' is at home
FrankAT (Proud to be a Datanaut)

[STS_Joshua]

Apologies, I should have been more explicit. 10 would be the value to start October with therefore it should be the final value for September. All of the month values are measures which are sums from their own respective tables like so:

Ins = SUM('Inputs'[Ins])

Outs = SUM('Outputs'[Outs])

The dates are a date table setup like so:

Dates = CALENDAR(FIRSTDATE('Inputs'[date]),LASTDATE('Inputs'[date]))

Final would then be a measure taking into account the Ins, Outs, and Current Inventory level that then works forward and back from the current Inventory because I have historical/projected ins and outs in their own respective tables. 

[Anonymous · Accepted solution]

Hi @STS_Joshua ,

Please try to create a measure as below:

Fin =
IF (
    MAX ( 'Date'[Date] ) = DATE ( 2019, 8, 1 ), //Start date: 2019/08/01
    12, //Initial Fin: 12
    12
        + CALCULATE (
            SUM ( 'Inputs'[Ins] ),
            FILTER (
                'Inputs',
                'Inputs'[Date] <= MAX ( 'Date'[Date] )
                    && 'Inputs'[Date] > DATE ( 2019, 8, 1 )
            )
        )
        - CALCULATE (
            SUM ( 'Outputs'[Outs] ),
            FILTER (
                'Outputs',
                'Outputs'[Date] <= MAX ( 'Date'[Date] )
                    && 'Outputs'[Date] > DATE ( 2019, 8, 1 )
            )
        )
)

If the above measure can't get your desired result, please provide some sample data of table Inputs and Outputs and your desired result with example. Thank you.

Best Regards
Community Support Team _ Rena Ruan
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