I just did a left outer join and in the result set
i have fields with a .NULL. value.

I would like to replace just the .NULL. valued fields
with a default value, let's say 10 (it is a numeric field).

However, I was unable to find the first .NULL. field
when trying the below commands:

LOCATE FOR nfld = .NULL.

LOCATE FOR EMPTY(nfld)

In both cases I am brought to the end of the file.

How can I consistently find the .NULL. valued fields?