Kohl participated in the late stage of WWII as a teenage soldier. He joined the Christian-Democratic Union (CDU) in 1947.
Kohl was a teenager when he joined the CDU
We don't know how old he was in 1947. I think the system had difficulty because it mixed up two concepts in the context
( z1 teenager :domain ( z2 person :name ( z3 name :op "Kohl" ) ) :time ( z4 join :ARG0 z2 :ARG1 ( z5 organization :name ( z6 name :op "CDU" ) ) ) )