BI Viewer / Calculated Fields

Hi all,

is there some documentation about BIViever's Calculated Fields ? 

I cannot find info/examples about:

• aggr
• filter
• joinRule

I need to compare values against the value of a specific row, but I'm not able to find a solution.

Do someone faced the same challenge ? Do someone have more info about the above mentioned functions ? 

TIA

regards

FabioG