cannot create a calculated column with groupby, summarize, summarizecolumns

[OlegV]

Hello,

I am stuck with the code, please help me.

I am createing a calculated table using variables. At a certain step, I need to group leftjoined tables and create a calculated column "ActualDeliveryDate". The aim is populate the "ActuralDeliveryDate" column with the maximum delivery date for each SalesOrder, but only if there are no blank delivery dates for that SalesOrder. If there are any blank delivery dates, it replaces them with BLANK() using this code

"ActuralDeliveryDate",if(COUNTROWS(FILTER(join_tab,[SalesOrder] = EARLIER([SalesOrder]) && ISBLANK([ActualDeliveryDate]))) > 0, BLANK(),MAXX(CURRENTGROUP(),[ActualDeliveryDate])

1) when I use a groupby function, it does not work,
2) when I use summarise function, it works, but this code does not sum correctly.

"TotalQty", CALCULATE(SUMX(join_tab,[Quantity]))

 SUMX is summing up all the rows in the join_tab, not considering the context in which it's being called.

3) when I use summarisecolumns function, it does not work, because group_colums are not qualified

I really do no know what to do. Please help me.

HERE IS A LINK TO A SAMPLE PBI FILE on my onedrive
sample.pbix

[OlegV · Accepted solution]

Here is a working solution:

var group_tab =
 ADDCOLUMNS(
SUMMARIZE(
    join_tab,
    [SalesOrder],
    [OrderDate]),
    "TotalQty", SUMX(FILTER(join_tab,[SalesOrder] = EARLIER([SalesOrder])),[Quantity]),
    "ActuralDeliveryDate",if(COUNTROWS(FILTER(join_tab,[SalesOrder] = EARLIER([SalesOrder]) && ISBLANK([ActualDeliveryDate]))) > 0, BLANK(),MAXX(FILTER(join_tab,[SalesOrder] = EARLIER([SalesOrder]),[ActualDeliveryDate])
)
)

[AnalyticPulse]

@OlegV 

Instead of trying to directly calculate the ActualDeliveryDate in a calculated table using variables, you might consider using measures to dynamically calculate it based on the context of your visuals.

can you provide sample data fo reference.

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[OlegV]

@AnalyticPulse 

here is a link to sample pbi file 
sample.pbix

I will not use this calculate table in any visual in power bi desktop. I will paste it to Powerbi report builder, and create a report.