How to restrict trade to one per day from my stock list in Tradetron

I want to create a strategy for positional buying only from my stock list. I want when ever the conditions are satisfied, selected stocks from the list will be bought. Tradetron should restrict to buy the stocks only once per day. And wish to ensure that the given stock is traded maximum once per day. How can it be achieved in Tradetron?
Suppose I have 20 stocks in my list. On day one, 5 stocks satisfied the buying condition. I want tradetron should buy all 5 stocks only once on that day.
If the condition get satisfied for the same 5 stocks on the next day, then again these 5 stocks will be bought only once on the next day.
This is how I want to restrict the number of trades per day.
Remember this is a positional trade and there is no exit.