The parameter may not be used as a Word or integer, but instead as a set of bits (typical for the alarm configuration, for example).
On the goto pop-up window, there will be a tick box just above the buttons mentioning something like other places used or different data types... tick that and see if it pops up.
Another possibility, which will be a pain to figure out, is if someone feeds the number 83 to an FC or FB to create a pointer and use that DB via indirect addressing. If that's the case then you'll have to check a bit more stuff than normal.