Non default Paper tray in Adobe Print Forms

I am trying to get Adobe forms printing to non default tray for HP 4350

The documentation about TRay control with Adobe here:

https://www.sdn.sap.com/irj/sdn/adobe?rid=/library/uuid/802ca378-5689-2a10-5298-e537562ba939

I am having trouble following the instructions

For my Adobe form

I made the the first Masterpage's Paper Type as "A4 Letterhead"

The xml for this is stored as stock="a4Letterhead"

I then create a new xdc "zhp4350pcl5e.xdc" from one of the implemented ones hp4350pcl5e.xdc in system.

I modifed it and added:

<medium stock="a4Letterhead" short="210mm" long="297mm">26</medium>

<inputTrayDefinition name="Tray 3" medium="a4Letterhead" trayNumber="4"/>

I then upload this into /usr/sap/RD3/SYS/global/AdobeDocumentServices/lib/

I copied a Device type ZHP4350 from HP4350

Modied my test printer in SPAD to use new deveice type ZHP4350

I then used program via se38 RSPO0022 to add to table TSP0B with entry for ZHP4350, PCL and zhp4350pcl5e.xdc

I have tried the above with no luck as it still prints to default tray. I modify <inputTrayDefinition name="Tray 3" medium="a4Letterhead" trayNumber="4"/> to a different trayNumber="2 " or "3" or "5" and re-uploaded and I even made sure used se38 RSPO0022 to delete and re-create after each change (Not sure if necessary)

What am I missing?