Trades with the same TP, SL and TS must have various trading size..otherwise they will be canceled.. basically as rules said...
changes will be implemented that willrequire all trades that have a TP, SL, or TS to be a unique size. After these changes are implemented, the only scenario in which two trades of the same currency pair can be the same size is if neither trade has a TP, SL, or TS.
you will find more info here,,
https://oanda.secure.force.com/Answe...language=en_US
Attached Image
1