SSRS Parameter Not Passing Into Query

Question

I have two parameters in my report, @CustomerId and @SalesType, however the @CustomerId parameter is not passing correctly into my report and results in the error Must declare the scalar variable "@CustomerId".

Below is the beginning of my query where this is happening.

Declare @customer nvarchar(max) , @sales varchar(10)
Set @customer = @CustomerId;
Set @sales = @SalesType;

The parameter is the correct case and is a multi-select parameter. Why could this be happening? If i define it it work, @SalesType works so im stuck why @CustomerId isnt.

Thank you.

Answer 1

A multi-select parameter can contain multiple values, so it should be used more like this:

where table.customerId in (@CustomerID)

Perhaps you can elaborate on why you need to assign it to a variable if that won't work for you.