PL/SQL and null

I think I remember something about PL/SQL having trouble when passing null to 
a function. But searchinf for pl/sql and null doesn't bring any informative 
links.

I can go through the steps of a function one by one in psql and everything 
works fine.

But when I call the function with nulls for some of the parameters, it 
doesn't work.

What puzzles me more is that I tried to pass 0 (zero) instead and then let 
the function subsitute it with null (simple IF param = 0 then v_param := null 
thing). Still no luck.

I'm using 7.0.3. 

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