Try this:
Have a script button with the script that takes you to the Network Assignment screen in CN22.
Create a new script like the following, then attach it to the OnBeforeRefresh event of the screen:
if (triggerType !== source.EVENT_ENTER) return;
if (focused && focused.id === 'ID_1'){
session.findById("ID_button").press();
}
where ID_1 is the field where you are going to press ENTER in (or for ENTER anywhere, you don't need the IF) and ID_button is the ID of your script button.
Now hide your script button.
This should hopefully achieve what you're after - however if the transaction is coded to do something / go to another screen on the ENTER press, then this may not work.