I am a first time Infopath user (still need to read a lot) and run in to this, this might be a syntax error on my side any idea????
Expected value type: ,
Actual value: string
IF(../my:Selection="27/08/2018 from 10h00 to 12h00 (Bloemfontein)" and COUNT(../my:Selection)>=100, -->"Fully Booked"<--, ...