OSIS-5372 set prerequisite field as uppercase charfield
OSIS-5372 set prerequisite field as uppercase charfield

uclouvain/OSIS-Louvain,uclouvain/osis,uclouvain/osis,uclouvain/osis,uclouvain/osis,uclouvain/OSIS-Louvain,uclouvain/OSIS-Louvain