Modifying the volume of a pending order

 
Hello,
is there a MQL5 function for changing the volume of a pending order in an hedging account? Similar like changing SL or TP?

Of course I can delete the order and reopen a new one with a different volume. But I want to avoid it if possible (more traffic).

Thanks

Matthias 
 
This is not possible.
 
Alain Verleyen :
This is not possible.
Too bad