Good day

I would like to find out what the requirements is on the enetertainment expense claims from reps who earn more than 50% of their income from comission.
Can they claim any entertainment expense relating to business as a tax deductable expense on their comission every month? or is it only at year end when they do their tax returns?
Do they have to write all the customers details i.e. name and ID numbers on the back of the slips that they use to claim?