panelview 300 replacing dtam

Iam replacing a dtam on a slc3 The program for the dtam function keys uses registary keys n13:20 to n13:29. i have been unable to get the function keys to work on this. Should i just use the keys as a bit enabled momentary buttun and delete the n13;20 from the plc program?

any help much appeciated!

It would be easier for posters here to examine the plc logic that works with former DTAM to better help you with recommendations on how the PV300 will replace it. Can you print the logic to a PDF file and post it here?