On Friday afternoons I want to sell all of my positions so I can start with a blank slate on Monday. I thought that I could accomplish this on a Friday by opening my strategy file and adding a condition to buy only on Mondays. But when I add this condition I see that sell limit orders and stop losses are no longer generated. From our earlier correspondence I now understand that adding the "buy only on Monday" constraint breaks a logic loop.

Can you recommend another means of accomplishing the goal of changing the strategy code to only sell?

I'm using a simple rules based strategy, which is to: buy at limit channel low with a channel period of 18. Sell at channel high with a channel period of 18. Sell at stop loss of 25%. Running this on a 5 minute scale.

You can't only sell because the "engine" needs to have a [hypothetical] Position to exit. At the very least you'd have to Buy a dummy position just to sell it.

Buy only on Monday and sell everything on Friday shouldn't be a problem - just drag the Condition Date/Time > "Date is a day of week" to the Buy rule. Also add another Sell rule (Sell At Market or At Close) and drag another "Date is a day of week" rule on top of it.

Does that work for you?