While trying to implement the above (Full AHT2 in the pic) I got this as opposed to the original Full AHT in the pic.
Hopefully Full AHT2 is correct; can you confirm?
2020-01-13_190103.jpg
edit post posting:
Now I'm getting the feeling you meant to say:
If OB AHT = "" or 0, the value of Full AHT is IB AHT/IB Tasks
?