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roleValue support for multi-level sets

Many OLAP technologies offer the ability to have a member property, with the same name, spanning multiple levels. At the moment there is no good way of getting that common attribute into a report when building a mulit-level set.

I may have a set expression like this:

descendants([Level1],1, self beforewithmember after)

I would like to be able to use roleValue('ShortName',currentMember(hierarchy))

This should let me show the ShortName for each member in the crosstab rows, regardless of the level.

At the moment when I do this I get the following error:

XQE-PLN-0266 The query contains a role value function with an invalid first argument: 'ShortName' is not a valid role or property.

This is because the MDX validator is automatically failing roleValue expressions against multi-level set.

The MDX that's generated against a single-level set:

SELECT

DESCENDANTS([R_PRODUCT].[R_PRODUCT].[Level1], 1) DIMENSION PROPERTIES PARENT_LEVEL, PARENT_UNIQUE_NAME, [R_PRODUCT].[ShortName] ON AXIS(0)

works, an I would expect a multi-level set to work exactly the same way:

SELECT

DESCENDANTS([R_PRODUCT].[R_PRODUCT].[Level1], 1, SELF_AND_AFTER) DIMENSION PROPERTIES PARENT_LEVEL, PARENT_UNIQUE_NAME, [R_PRODUCT].[ShortName] ON AXIS(0)

This is especially frustrating in a TM1 environment where the member properties that DO work (alias, description) have a uniqueness requirement that prevents it from working.

I personally believe this is a bug in the product, however I was instructed to open this as an RFE.

  • Avatar32.5fb70cce7410889e661286fd7f1897de Guest
  • Oct 23 2020
  • Future consideration
Who would benefit from this IDEA? At the moment report authors have NO way of building this output. So both report authors and consumers will benefit.
How should it work?

My solution is to change the validator to throw a warning when this happens. Let the cube throw the error if it's not actually valid. This is an example of Cognos incorrectly thinking that it knows better than the developer.

Idea Priority Urgent
Priority Justification This is ranked urgent because I have required reports which I am unable to provide without significant work-arounds.
  • Attach files
  • Admin
    Rachel Su commented
    30 Oct 12:45pm

    This is not currently planned but we will continue monitoring this request through voting.


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