User function code not substituted

Hi
I have a user function (getCode(...)) of the form
case
when exists (select * from ...)
then '!Ok!'
else '!None!'
end
When I use this function in a interface mapping (getCode(a,b,c)), the code is not substituted in the generated query (as seen in the operator):
insert /*+ APPEND */ into ...
     Z_CODE,
     RUN_NR,
     REC_ID
select
     getCode( NAME, 'ZIV', 'G' ),
     RUN_NR,
     REC_ID
from     ...
where     (1=1)
and the execution results in an ORA-00904 exception: Invalid column name.
How come?
Thanks

First of all, thanks for your answers!
The problem was lying in the definition of the function's syntax:
I'm using the possibility to specify the data_type of the arguments: getCode($(run_nr)n, $(tabi)s, $(code)s).
Unfortunately, I put a space between the arg_name and the data_type! This causes the function not to be substituted into the query ...
Once again thanks to all.
Cheers, Benno

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