As a first step in the direction of investigation, do onething. Find the technical name of the troubled field (Repair dur.) . Hope you know how --> by placing cursor in the field and pressing F1 key. For example the technical name of field Unitof Breakdown dur.is VIQMEL-MAUEH.
Better give technical names of all fields related to Repair section viz.,
Repair Start Date,
Repair Start Time,
Repair End Date,
Repair End Time,
Repair dur.
Unit
KJogeswaraRao