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[ybatistamayo]

I have two tables, one of "Cost" and one of "Taxes", in the latter the "tax" column is updated every year.
also the column that I have to relate both tables is "IDCOST".
The first problem is that I tried the "Many to many" relationship and it didn't work.
I want to relate both tables to get a final result as shown.
that is, calculate the tax according to the year of the date column.

[v-joesh-msft]

Hi @ybatistamayo ,

If none of the tables selected for the relationship has unique values, you can refer to this article:

https://blogs.technet.microsoft.com/cansql/2016/12/19/relationships-in-power-bi-fixing-one-of-the-co...

"We first need to create a new query, appending values from both existing ones: in the query editor, Home tab, select Append Query as New."

[MFelix · Accepted solution]

Hi @ybatistamayo ,

You need to create a table with unique values for IDCOST and then pass the relationship of both table by this making  many-to-many become two one-to-many  and then you are abble to have the calculation.

Regards,

MFelix