Thanks Mark,
I think it is a bug in the programme not an error in the market. Market prices pre play never fall to 1.01. I already have a condition like that in the conditions but when backing Amazing Dazy in the 15:50 Towc (UK horse win market), at best, it was about 2.62 back price, with the market not in play, and the lay price was within 3 ticks, it got matched in test at 1.01 see attached. Obviously immediately the stop loss fired and layed it at 2.66.
In V7 is there any way to get to the variable files (like in V6) so I can see what the exact back price was in the formulae when the bet was placed?