Null Capable Fields

We have fields defined within files as "Null Capable".
Within an RPG IV program we try to define fields using the "like" keyword over
null capable fields, or define fields using externally described data structures
over the file with null capable fields.
However, none of these fields defined internally to the RPG program are null
capable.

Is there a way to define fields internal to RPG programs as null capable?
If not, are there any ILE "C" functions etc.. that we can use within an RPG IV
program to assign null and/or determine if a field contains null?

Thanks in advance.
Brian Ellis.





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