Problem must be something related to the close quantity to close.

Try to round it to the nearest value with 1 decimal only:

CloseQuantity  = round(abs(CountOfPosition) - LeftQty, 1)

Hi Pierre,

Could you repost your code with the adjustments to the SL (regarding my not-so-really-nice-post but with the clear message) ?

Then we all can “see” better. OK ?
Thanks !

Pierre, although we can’t see anything now of the partial close (which you can’t have tested either over this weekend – just saying), I think I can see that this “construction” now can’t work. Why ?

TIMEFRAME(1hour)
sl = PositionPrice + AverageTrueRange[14](close)*pipsize
timeframe(default)

Your entry will have been on a higher frequency TF. Say 5 minutes. Then the code runs into what I quoted above, and you are telling the system to register the sl the first next whole hour. Thus if the trade was entered at e.g. 15:10, then at 16:00 the sl is registered and only then for the next bar it will become active.

But also :

Because the Pending Stop commands are re-executed each 5 minutes (thus 5 minute TF assumed), it will give a price of 0n. Thus

if longonmarket and close < slpricelong then
  sell at sl stop
endif

that will read as : Sell at 0 stop.

That will never happen unless some larger Wars emerge.
It will only start to work at the next whole hour and within in the next bar of 5 minutes to come.

Also this

if shortonmarket and close > slpriceshort then
  exitshort at sl stop
endif

which will be read as : exitshort at 0 stop

will do unexpected things, as it will exit as a Market order because with the 0 you will be under the price (but should be above for a Short) and it will go out regardless. Thus, in the next 5 minute bar after the Trade was taken (a position emerged).

… And so what you will observe is all over the place and maybe by some coincidence it works (like the trade taken at 15:55 because the next bar will fall on the 1H TF and things will work out the next 5m bar  after that).

So you see, the again-not-so-nice-message is that PRT may contain some bugs or more, but you are the buggy one to begin with. :-).
Try to get the hang of this all for 100% first before you start to work with increasing / decreasing positions.

But … I saw no conflicting Stop commands any more, so good. Maybe try to work some more from top to bottom (the code is executed from top to bottom) so it doesn’t read upside down to others (me) and yourself. In what you showed now it looks harmless (at a glance) but when things get more complex it better be readable.

Have fun now !

Well, it is merely about how the Pending orders work. And may way of talking of course.

If you sell a Long position for a price higher or equal 0 it will go out. So the pending stop you intended (read : the way a Stop order works) will never do what you expect it to do. You have an sl with a price in there (that is what you think) but the price is still zero, until the Hour expires.

So it does not matter all that much how I write it – it is about your construction which can not work.

Pseudo code :

Price = 12000
Sell at 11980 Stop

That would work, when the price drops to 11980.

What you virtually have is :

Price is 12000
Sell at 0 Stop

And that will never happen (hopefully).
And Yes, how Stop (and Limit) orders work, is by rules. Btw world wide – not only PRT or IG etc. Maybe Google those and you may run into a couple of more surprises. Try :

stop order investopedia

… only as an example. 🙂

Edit :

Why will it give a price of 0

I explained that. Because that piece of code is executed only once per hour and you never fill the sl value until the whole hour. Now maybe better investigate TimeFrames in PRT.

If your PositionSize is not large enough to leave the minimum position size required by the broker, the entire position will be closed.

Backtests with 1 open position reports several partial closing events where the left quantity is 0.75 and 0.5.

If the broker request, say, a minimum 1 position open, then that position will be closed entirely. In this case try with 3 or more lots.

Did you graph that variable to see what is the calculated quantity exactly?

As per short position, you have to put a minus before the value:

exitshort -CloseQuantity contract at market

Because COUNTOFPOSITION returns a negative value for short orders, so — is equal to + in this case.