Round numbers detector is some kind of filter, it should be placed somewhere under "on Tick" so it can check the current price at every tick and it would pass every time the price reaches a new round number. But this block is not really suitable for making pending orders.
In the pending orders blocks there is nothing about round numbers, this is something that I should add, but who knows when. Anyway, I got something for you. These are some simple formulas for calculating round numbers out of the Bid price (in this example): https://fxdreema.com/shared/xHE9eHHHc
MathCeil() and MathFloor() are MQL4 functions that give you the nearest bigger and the nearest smaller integer:
https://www.mql5.com/en/docs/standardlibrary/mathematics/stat/mathsubfunctions/statmathceil
https://www.mql5.com/en/docs/standardlibrary/mathematics/stat/mathsubfunctions/statmathfloor
Bid is a predefined variable in MQL4 and it gives you the current Bid price of course. There is Ask as well.
My example gives this result on the chart: http://prntscr.com/hafr46
These values can be used as Open Price for a pending order and you can also customize the formula if you want.
