Difference in dimensional expressions between RS8.2 and 8.3 - part two

I found another one

code in 8.2

set( emptySet([My Dimension].[My Hierarchy]) )

code in 8.3

set( item(emptySet([My Dimension].[My Hierarchy]),0) )

without the use of item() you get an error
Invalid coercion from 'memberSet' to 'member, measure'
even though the expression validates.

This is important when you want to create prompts that return MUNs but are optional.
As a recap from my older posts optional for a prompt means that it has a default value. The default is ... no members selected
...in other words: empty set

Difference in dimensional expressions between RS8.2 and 8.3

We are just upgrading to Cognos 8.3 (I know, I know...) and I've just found this difference in the use of the filter() function:


I think it actually makes more sense in 8.3... probably that's why they fixed it.

Code in 8.2

filter(
[My Dimension].[My Hierarchy].[My Level],
roleValue('_businessKey', currentMember([My Dimension].[My Hierarchy])) contains ?Param1?
)


Code in 8.3

filter(
[My Dimension].[My Hierarchy].[My Level],
roleValue('_businessKey', [My Dimension].[My Hierarchy].[My Level]) contains ?Param1?
)

In 8.2 one had to use the currentMember() function to refer to the member being filtered.
In 8.3 it is not needed. Instead one can just use the level.