FxPro uses a dynamic Forex leverage model on the MT4 and MT5 platforms, which automatically adapts to trading positions of customers. As the volume of a customer increases, for each instrument, the proposed maximum lever will decrease accordingly, as in the value table below.
This applies to each trading instrument, so if a client has open positions on different instruments, the leverage will be calculated separately for each Forex symbol. For example, if a trader has 300 lots to buy on the USD / JPY, and he also decides to trade on the EUR / USD, his margin required for EUR / USD will not be affected by Positions on the existing USD / JPY.
Info : http://www.fxpro.com/