I was trying to display values that are null as 0 using format_string.
I currently have the following:
WITH
MEMBER [test] AS null, FORMAT_STRING = '0.#;Neg (0.#);0.00;0.00'
SELECT
[test] ON COLUMNS
FROM [Sales]
The fourth value (;0.00) should format the null values to zeros. I read that here: https://msdn.microsoft.com/en-us/library/ms146084.aspx
Currently it shows nothing. It should show 0.00.
You can try it here: http://www.iccube.com/run-mdx
It is a bug (ic3pub_159) that is going to be fixed in the next version. As a workaround you can use the coalesceEmpty MDX function.
CoalesceEmpty( [MyValue] , 0.0 )