Issue with prompt with multiple values using universe

Hi guys,

I have an application based on universe using a parameter with multiple values.

The business layer has defined a parameter 'Ger' with "Allow multiple values" and "Prompt to users" in on:

Then, into the application, the data source has this setting in the query specification:

Here, I can see the multiple values entries:

But when I execute the application I only see a single value:

We are using 1.6 SP1.

Please, any idea to solve this? Are there something I did wrong?

Thanks in advance!

Andrea.