Once you enter a futures position, the entry price can change daily, unlike traditional Forex instruments where it remains constant. Here's an example to illustrate this:
A trader enters a position on the Japanese Yen at an entry price of 0.0071655 and holds it overnight.
On the next day, the Japanese Yen's price rises to 0.0071695. The entry price adjusts immediately to reflect this change, becoming 0.0071695. Although it may seem that your entry price has changed, the price difference (profit) of 0.0000040 is recorded in the equity and is not lost.
In summary, the ultimate P&L outcome remains the same regardless of whether the entry price changes daily or not. The future method allows for a detailed tracking of price fluctuations, showing the cumulative profit in a step-by-step manner.