As Prepaid Sales is expended, it automatically gets transfered to CURRENT Sales, so therefore the account is not split - though I do see the merit (imagine what the ledger would look like; it would have Prepaid Sales Rev and Debtors Control seperate - so it may be correct). That is as far as I was taught, anyway.
My last question looked like this (in previous exams a similar question was asked, and they accepted two different ways - but they allude me; by dividing total sales by cost of sales to get a general mark-up):
Prepaid Sales Revenue DR 400
Debtors Control DR 5100
Debtor - Motel Vegas SubDR 5100
Sales Revenue CR 5000
GST Clearing CR 500
Cost of Sales DR 2002 (Or something around there)
Stock Control CR 2002
The question was not vague at all. Had to be read correctly and years ago, they accepted the journal without cost of sales or stock control entries because of the same lack of information given in this one.