Running total - exclude if no orders for months

[PeterStuhr]

Hi all,

I have a challenge I would need some help with.

My setup:

* Sales table containing "Company ID", "Order Date", "Revenue".

* Company table containing dimensions (Relation to Company ID)

* Date table (Relation to Order Date)

I would like to do a running total showing number of companies (customers we have), based on their first order.

However, if a customer suddenly has not bought for 18 months, they should not be included in the next months.

Example:

Company A buys first time 1st Jan 2015. They are counted every month ahead. Let's say their last order is 31 May 2015, then they should be counted from Jan 2015 until Nov 2016 (18 months since 31 May 2015). After that, they should not be counted anymore. It is important that they are STILL counted all months before the 18 months, but only not counted after that period. How would I do that?

I have tried with this: 

DateDiffMonths = DATEDIFF(TODAY(), [Last Date], MONTH)

However, that is looking in real time from TODAY always, which is not what I want. I want it to look "based on each month" if there was order 18 months back.

I hope it makes sense!

Thanks!

[amitchandak]

@PeterStuhr ,Can you share sample data and sample output in table format? Or a sample pbix after removing sensitive data.

[PeterStuhr]

Hello,

Here I put an example of Companies and Order Date, and I added a column showing "CountUntil", meaning for how long this company (based on each order) should count in the rolling total companies. 

ID	Order Date	Last Until
A	01-01-2015	24-06-2016
A	25-06-2015	16-12-2016
A	12-12-2015	04-06-2017
A	01-03-2016	23-08-2017
A	05-08-2016	27-01-2018
A	01-12-2016	25-05-2018
B	01-01-2015	24-06-2016
B	25-06-2015	16-12-2016
B	12-12-2015	04-06-2017
B	01-03-2016	23-08-2017
B	05-08-2016	27-01-2018
B	01-12-2016	25-05-2018
B	01-01-2017	25-06-2018
B	14-02-2017	08-08-2018
C	01-06-2017	23-11-2018
C	14-10-2017	07-04-2019
C	17-07-2018	08-01-2020
C	12-12-2019	04-06-2021

And here is my desired output:

Example: Company A has its first order Jan 2015, and its last order Dec 2016. It means it should count until May 2018 (Last Order + 18 months). 

How do I make this in PBI?