I have a problem with Custom IR code. It doesn't work.

I have a new dpx1100 and I would like to use extended IR code
For example the standard IR Code for S-VIDEO Button is D1 D8 inYamaha PDF's file and when I use the "learning mode" the IR code in ipronto is 900A 006D 0000 0001 D12E D827.
The buton "Zoom" is not on the remote control and I saw that the Extended code for "Zoom" was D1 EC. I made a copy to a new button and I wrote 900A 006D 0000 0001 D12E EC27. I replaced D8 by EC but it doesn' work.

Could you help me ?

Thanks a lot
Olivier