Adobe Analytics API - Real Time Classification - adobe

Question

I need to get from Omniture real time API a classify eVar, exclude some value, and then breackdown its with sitesection.
I try with this query:
{
"reportDescription": {
"source": "realtime",
"reportSuiteID": "**RSID**", //MY REPORT SUITE
"metrics": [{
"id": "instances"
}],
"elements": [{
"id": "evar", //MY EVAR
"top": 100,
"classification": "Real Time", //CLASSIFICATION NAME
"search": {
"type": "NOT",
"keywords": ["somevalue"] //THE VALUE TO EXCLUDE
}
},{
"id" : "sitesection",
"top" : 1
}],
"dateGranularity": "minute:1",
"dateFrom": "-1 minute"
}
}
But in the JSON response I see "somevalue" how if it not excluded.
The strange thing is that if I remove the "breakdown" (with sitesection) the classification filter seems to works fine.
I can't use classification filter if a breackdown is used in real time report? I can't find any documentation about that.
An other thing is that if I request a report with the classification, without any search, I receve the response but there is a lot of "::Unspecified::". The problem is that the "::Unspecified::" seems to be the last datas that Omniture receves form my webpages. I think this means that classifications are not in real time, also if you can to use it in real time report.