How to create dynamic child table with DAX in PowerBI - powerbi

Question

I have this table:
Order | Total | FirstPayment | Months
1 | 1000 | 2021-01-01 | 2
2 | 600 | 2021-02-01 | 3
And I need to create a another table with the installments, like this:
Month | Order | Value
2021-01-01 | 1 | 500
2021-02-01 | 1 | 500
2021-02-01 | 2 | 200
2021-03-01 | 2 | 200
2021-04-01 | 2 | 200
So, I want to create a child table with one row for each month of payment.
Please, can you help?

Answer 1

As per my comment, I would actually do it like this:
Create dates table that spans all dates between two ranges. You could actually filter it to contain only relevant dates for better performance, but I didn't bother (this is a table formula):
Payments = CALENDAR(MIN(Orders[FirstPayment]), MAXX(Orders, EDATE(Orders[FirstPayment], Orders[Months])))
Create a measure that would show appropriate values for relevant dates:
Payment amount =
SUMX (
Payments,
VAR d =
DAY ( Payments[Date] )
RETURN
SUMX (
FILTER (
Orders,
DAY ( Orders[FirstPayment] )
== d
&& Payments[Date] <= EDATE ( Orders[FirstPayment], Orders[Months] -1 )
&& Payments[Date] >= Orders[FirstPayment]
),
[Total] / [Months]
)
)
The result - based on Order from Orders table and Date from Payments table:
EDIT
Of course, it is also possible to do what you asked. You have to combine the two formulas to create a calculated table like this (below is a table formula that you apply when you select New table):
Installments =
SELECTCOLUMNS (
FILTER (
CROSSJOIN (
CALENDAR (
MIN ( Orders[FirstPayment] ),
MAXX ( Orders, EDATE ( Orders[FirstPayment], Orders[Months] ) )
),
Orders
),
[Date] >= [FirstPayment]
&& DAY ( [Date] ) = DAY ( [FirstPayment] )
&& [Date]
<= EDATE ( [FirstPayment], [Months] - 1 )
),
"Date", [Date],
"Order", [Order],
"Value", [Total] / [Months]
)