Hi Michal,I reproduce the same issue as you, whenever selecting List radio button choice. I guess there is a bug in Report module for List, because I tried with Lists with other target dimension schema than recipients and it occurs the same error.Please take the time to create a bug report on Adobe Campaign extranet web site.In the meanwhile, please use this workaroung, I tried it and it works fine for me; in Report app Query activity:1. choose the 1st Radio button: Database schema2. select the ...