Ah ... so the ea that trails the stop cannot operate on the same chart?

Regarding the parameter you mention, it may be that the Lot should be divisible by 3 - e.g. 0.o6, 0.3, 0.9, 2.7, etc. - and the ea closes a third of the Lot size at a time? (Your Broker would hve to support these fractional Lot sizes also.) Not sure though.

Thanks, Richard.