What to do in this situation
 

I am currently running a number of lay systems, and a few back systems. What is the best thing to do when a horse is selected by both teh lay and back system? Do you simply bypass the race/horse? Or would you back and lay it, as the systems are seperate?

You don't change anything. Back and lay for each of the systems. As soon as you start dropping selections out for non-system reasons, you're not being systematic ;)

That's a ticklish one.

If you don't want to both bet and lay I suppose you can follow the more successful of the two systems.

Maybe the Bet system as I assume there is more money to be made and less to lose?

I feel it would depend if one is stopping at the first success or not.

If one is targeting a number of successes before stopping for the day , I would bet both ,because they are being bet as separate entities to one another.

One thing I would not do is double up on a horse where 2 or more systems have the same selection say to win.
e.g. If selected twice does not mean it has twice as much chance of winning , so just treat it as a single bet.