how to avoid the error "Category member XXX defined as an empty set" in icCube? - mdx

Question

I've got the following MDX code to create a category dimension with 4 members:
all members that make up of 0-50% of the measure (TopPercent)
members 50-80%
members 80-95%
members 95-100%
The code works perfectly on levels with a lot of members:
WITH
MEMBER [measures].[v] as eval([Tijd].[Tijd].[jaar].[2018],[Measures].[Bedrag])
set [selection] as Order( nonempty([Categorie].[Categorie].[categorie].members,[measures].[v]), [measures].[v], BDESC)
CATEGORY HIERARCHY [Stats].[ABCD], DEFAULT_MEMBER_NAME = "Totaal", LEVEL_NAME_PATTERN="L - ABCD - ${levelDepth}"
CATEGORY MEMBER [Stats].[ABCD].[Totaal].[A (0-50%)] as
TopPercent([selection],50, [measures].[v] ), ADD_CHILDREN=true
CATEGORY MEMBER [Stats].[ABCD].[Totaal].[B (50-80%)] as
TopPercent([selection],80, [measures].[v] )
- TopPercent([selection],50, [measures].[v]), ADD_CHILDREN=true
CATEGORY MEMBER [Stats].[ABCD].[Totaal].[C (80-95%)] as
TopPercent([selection],95, [measures].[v])
- TopPercent([selection],80, [measures].[v] ), ADD_CHILDREN=true
CATEGORY MEMBER [Stats].[ABCD].[Totaal].[D (95-100%)] as
Order([selection], [measures].[v], BDESC)
- TopPercent([selection],95, [measures].[v]), ADD_CHILDREN=true
SELECT
// Measures
{[measures].[v]} On 0,
// Columns
[Stats].[ABCD].[L - ABCD - 1].members on 1,
// Rows
[Stats].[ABCD].[L - ABCD - 2].members on 2
FROM (select [Tijd].[jaar].[2018] on 0 from [Spendzoom])
/*ic3navigation*/
But when I run the MDX code with:
set [selection] as Order( nonempty([Categorie].[Categorie].[type].members,[measures].[v]), [measures].[v], BDESC)
I get the error: Category member "[Stats].[ABCD].[Totaal].[C (80-95%)]'defined as an empty set.
I have tried to rewrite the definitions, as:
subcubeminus(TopPercent .... , TopPercent)
But that gave completely strange results.
How can I overcome this error and have a generic approach that allways works regardless of the contents of the hierarchy & level in the [selection] definition?

Answer 1

To understand what happening you should check how TopPercent works (it's not really whay you expected).
Try this MDX :
WITH
MEMBER [measures].[v] as eval([Tijd].[Tijd].[jaar].[2018],[Measures].[Bedrag])
STATIC SET [selection] as [Categorie].[Categorie].[categorie].members
SELECT
[measures].[v] On 0,
TopPercent([selection],95, [measures].[v]) on 1,
TopPercent([selection],80, [measures].[v] ) on 2
FROM
(select [Tijd].[jaar].[2018] on 0 from [Spendzoom])
As you see both return the same set, and that is not what you are looking I guess.

Answer 2

As ic3 mentioned in the comments, as of icCube 6.8.10, icCube allows now to have empty categories. Y
For me this means, business wise, that regardless of the global filter settings the categories ALWAYS work. In case it is an empty set, it results a blank value in the dashboards.
example of a Parato analysis for just 1 vendor (bedrag = amount, #Fact = nr of invoices, #Lev = nr of suppliers)
Exactly as desired.