Mech500
Given the crew composition, I can only assume Dit means
Purser = Senior Cabin Attendant = SCA
Junior = Cabin Attendant.
Each airline have their own terms of endearment for the various levels of Cabin crew seniority. Without wishing to highjack the thread normally, the use of 'Purser' or 'Cabin Service Director/Manager' is reserved for use in larger aircraft where there are more cabin crew to manage - or the self-engrandisment of SCAs in smaller aircraft.
I hope that answers your question.
HWB