Visualization Issues using Running Total on an Appended Query - powerbi

Question

Using PowerBI linked to two separate Access Databases.
I have two datasets containing cost estimates. The cost estimates in Dataset 1 run through 2054; the cost estimates in Dataset 2 run through 2074. I used the Append function to join the two tables together and used the Quick Measure for Running Total to create values for cumulative cost by year. I charted this measure and noticed a significant decrease between 2054 and 2055 and was able to determine that the decrease is the cumulative value for Dataset 1. Does anybody know any ways to fix this?
Roughly explained:
Dataset 1 through 2054 totals to 4.5M.
Dataset 2 through 2054 totals to 3M
Dataset 2 through 2055 totals to 3.25M
Appended Dataset through 2054 totals to 7.5M
Appended Dataset through 2055 totals 3.25M instead of the expected 7.75M
I think the issue might be caused by Dataset 1 not having a value for 2055 or after, but I'm not sure how to resolve this issue.
The measure I'm using is:
Cumulative Cost =
CALCULATE(
SUM('AppendedQuery'[Value]),
FILTER(
ALLSELECTED('AppendedQuery'[Year]),
ISONORAFTER('AppendedQuery'[Year], MAX('AppendedQuery'[Year]), DESC)
)
)
ETA: Picture to explain

Answer 1

Here is your Dataset 1-
Here is your Dataset 2-
Here is your final Dataset after appending Dataset 1 & 2
And finally, here is the output when you are adding column Year and Cumulative Cost to a table visual. As standard PBI behavior, this is just grouping data using column Year and and applying SUM to the column Cumulative Cost.
The calculations are simple-
2051 > 1 + 1 = 2
2052 > 2 + 2 = 4
2053 > 3 + 3 = 6
2054 > 4 + 4 = 8
2055 > 5 = 5
2056 > 6 = 6
=========================
Solution for your case:
I already said in the comments that the solution current data will be not a standard one and will consider fixed $1 per year per department. But if you are happy with this static consideration, you can apply these following steps to achieve your required output-
Step-1 Create a Custom Column as below (Adjust the table name as per yours)-
this_year_spent = IF('Dataset 3'[Cumulative Cost] = BLANK(),0,1)
Step-2 Create the following Measure-
cumulative =
VAR current_year = MIN('Dataset 3'[Year])
RETURN
CALCULATE(
SUM('Dataset 3'[this_year_spent]),
FILTER(
ALL('Dataset 3'),
'Dataset 3'[Year] <= current_year
)
)
Here is the final output-