GetData on hierarchy dimension

Hi experts,

I'm using a datasource that retrieves data from a simple Bex query with one key figure and two dimensions: month in columns, orgunit (hierarchy) in rows.

The data are correctly displayed in a cross tab.

I need to parse the content of the datasource, for this I retrieve the members of orgunit dimension:

var orgunitsTmp = DS_WLTIAWF.getMembers("0ORGUNIT", 200);

The getMembers method returns me the leaves of my hierarchy and I can then retrieve the data using getData:

orgunitsTmp.forEach(function(orgunit, index) {

var KF = DS_WLTIAWF.getData("007VOY9I8G6DGIPSM1HKB13IF", {

"0ORGUNIT":orgunit.internalKey,

"0CALMONTH":monthInternalKey

});

But this way I retrieve the figures on the leaves, how can I retrieve the agregates (here mean value) on the nodes?

Thanks for any idea,

Christian