Swap or Rollover is the interest rate differential between the two currencies involved in the pair you are trading. A swap/rollover fee is charged when a position is kept open overnight, and is calculated according to whether you are holding a long or a short position.
It is important to remember at all times that you can both gain and lose on swap and, as such, you have either positive rollover or negative rollover. There is a possibility that some instruments may have negative rollover values on both sides, because FxPro charges its own interest, therefore the positive and negative values are decreased accordingly.
In the trading terminal "swap" is automatically converted into the Balance currency. From Friday to Monday swap is charged once. From Wednesday to Thursday swap is charged in triple size.
For a complete list of FxPro's Forex Trading Conditions, please click here.