Comparing column values with measure

Hi there!

I have two tables (without relationship between them because of some businness rules). When I filter the CustomerID on table X, I have to check in every row of the table Y if this row is from this CustomerID. So, the first thing I've done was to create a measure in table Y as max(CustomerID), so the returned value is the clientID I'm filtering on table X. I need to do this:

Table X:

1º Filtered customer 123 in the CustomerID column

Table Y:

1º Create the measure M = max(CustomerID) that return to me the value 123

2º Now I have to create a table like this:

CustomerID   |  checkIfWasFilteredOnTableX

458                |               No

941                |               No

123                |               Yes

476                |               No

The problem is that I was not able to create a measure our column that I can use if(M = CustomerID, 'Yes', 'No') because it doesn't work! I've tried with Search function, Find function, Switch...but It does not work :(

Anybody have some idea?

PS.: Unfortnately I can't use parameters because I will have to publish this on PBI Service and the end-user have to be able to filter the CustomerID.

Thankss!!