Greetings.
You can get the whole information about Margin Requirements from the link below:
https://www.dukascopy.com/swiss/english/ ... ts/margin/As for your situation. Trader is not able to increase exposure on the account if the Use of leverage is more than 100%. Until then you are able only to decries exposure.
Positions initiated by Margin call are not controlled automatically. So you have to merge or close them by your own.
Best regards, Support team.