Parameter could not be resolved because it was referenced in an inner subexpression

One day while working on a SSRS report I got an error message “Parameter could not be resolved because it was referenced in an inner subexpression” when I was using parameterized MDX.
Here is the sample MDX where I got this error message

with member [Measures].[Jan SalesAmt] as '([Measures].[Average Sales Amount],strtomember("[Date].[Month].[Jan " + @Year2Digit + "]"))'
member [Measures].[Feb SalesAmt] as '([Measures].[Average Sales Amount],strtomember("[Date].[Month].[Feb " + @Year2Digit + "]"))'
select {

[Measures].[Jan SalesAmt],

[Measures].[Feb SalesAmt]

} on Columns,

non empty

[Customer].[Customer].[All Customers] on Rows

From [Adventure Works]

This MDX was used in one of the data set where I already declared the parameter “Year2Digit” in my dataset. After spending some time I was able to fix this problem and here is the solution – Remove single quotes from the member expression and this would fix the problem.

Here is the modified MDX...

with member [Measures].[Jan SalesAmt] as ([Measures].[Average Sales Amount],strtomember("[Date].[Month].[Jan " + @Year2Digit + "]"))
member [Measures].[Feb SalesAmt] as ([Measures].[Average Sales Amount],strtomember("[Date].[Month].[Feb " + @Year2Digit + "]"))
select {

[Measures].[Jan SalesAmt],

[Measures].[Feb SalesAmt]

} on Columns,

non empty

[Customer].[Customer].[All Customers] on Rows

From [Adventure Works]

I hope this helps.

Thanks,
Gaurav