Legend within a running total number

[DouweMeer]

So I'm completely stuck at the moment and I hope someone can help me out. 

I got this table with all our cases in it. I unpivot the table on the fields created date and closed date which resulted in a single field with date and an additional field defining whether it is closed, or created date. Now I have a single datum column for all my cases. What I now want to calculated is the amount of cases that were open, at a specific date with set filter. I started by adding 2 fields for closed and created in it the expression if ( 'attribute' = 'closed' , 1 , blank () ). This field is either named Create2, or Close2. 

So far it somehow works, but as soon I put a legend in it, it just shows me the total without the filter on legend and replicates this number for each legend. I've already tried multiple things, but it seems not to be working. 

What I got in Power BI: 

See the titles in the printscreen for an expression

Net open = create - close

What I expect :

[v-frfei-msft]

Hi @DouweMeer ,

Could you please share your sample data and excepted result to me if you don't have any Confidential Information.Please upload your files to One Drive and share the link here.

Regards,

Frank

[DouweMeer]

@v-frfei-msft 

So, I'm showing here what I actually want with Running total 3 with legend. This is created by allexcept and specifying Type as exception. This is the results I want, but then without pre specifying which columns I want to use as a filter.  

My fear is that it doesn't exist yet. 

[DouweMeer]

@v-frfei-msft 

So I created yesterday this example file with some added text boxes for explanation. Now I'm having issues adding it here. Apparently the company has blocked the websites onedrive and dropbox, so I can't share the link. The best I can do at the moment is make some printscreens. If you have a better idea, pleasae share it with me. I'll give it a try. 

What I think for its current behavior is caused by allselected. As the legend will be seen as 'implicit filters', they will be removed. Therefore it will return the total number of all types, instead of the type defined by the legend. What it needs, I think, is some sort of allexcept with being different is that it will only remove the implicit filters (/or and explicit filter) on a specified column. This specified column would be the 'case'[date] column.

Do you know of a way to achieve this? 

[DouweMeer]

A custom column in a separate date table would look like : 

Customn Column = calculate ( sum ( 'Case'[Create2] ) - sum ( 'Case'[Close2] ) , filter ( 'case' , 'Case'[date] <= 'Date table'[Date] ) )

For an legend, I would just create multiple columns with an additional filter behind it with , filter ( 'case' , 'case'[type] = "..." ). But that isn't really efficient and would prefer a measure for it :).