Measure Misunderstanding

[amilkarigi]

Hi, I'm trying to create a measure that calculates my top 10 buyers/customers who have bought an specific product (my top product from an specific year) which is calculated with another measure called Mas Vendidos, so here is my code:

Top Clientes = 
VAR
    Prod = [Mas Vendido]
VAR
    Cliente = VALUES(Clientes[CompanyName])
RETURN
    CALCULATE([Ventas Total];
        FILTER(Cliente;
            RANKX(ALL(Clientes[CompanyName]); [Ventas Total];;DESC) <= 10); Productos[ProductName] = Prod)

The thing is it returns an error:

"...a table of multiple values was supplied where a single value was expected"

And if I delete the Prod variable and change it at the end with "Halter Dress" (my top product) then it is correct.

Top Clientes P = 
VAR
    Cliente = VALUES(Clientes[CompanyName])
RETURN
    CALCULATE([Ventas Total];
        FILTER(Cliente;
            RANKX(ALL(Clientes[CompanyName]); [Ventas Total];;DESC) <= 10); Productos[ProductName] = "Halter Dress")

PSD: Mas Vendidos Code:

Mas Vendido = TOPN(1; ALL(Productos[ProductName]); [Ventas Total];DESC)

Error (with Prod variable)What I want it to show (with "Halter Dress" instead of Prod variable)

[mattbrice · Accepted solution]

I believe the error is because Dax engine has detected that your TOPN function in "Mas Vendido" could return more than one value (in a tie situation)  So I think you eithe either need to test if "Prod" variable has more than one row and respond accordingly, or perhaps wrap it in a FIRSTNONBLANK call like so:

Mas Vendido = FIRSTNONBLANK ( TOPN(1; ALL(Productos[ProductName]); [Ventas Total];DESC), 1 )

[amilkarigi]

Thanks a lot. It solved my problem just how i wanted it.