SQL User Defined Function Not Found

I have been experimenting with user defined functions in SQL. I have an RPG Service Program with the following subprocedure.

P pr_GetPlhNamW B EXPORT
D pr_GetPlhNamW PI 100a
D p_RefTyp 1a const
D p_RefNo 9a const
D p_AmdNo 3s 0 const
D p_Mode 1a const

D lw_Return s 100a
/free

return lw_Return;

/end-free
P pr_GetPlhNamW E

I have run the create function command with the following:

CREATE FUNCTION DEVAW/A (
CHAR(1), CHAR(9), DECIMAL(3,0), CHAR(1) )
RETURNS CHAR(100)
LANGUAGE RPGLE
SPECIFIC DEVAW/A
NOT DETERMINISTIC
NO SQL
RETURNS NULL ON NULL INPUT
DISALLOW PARALLEL
NOT FENCED
EXTERNAL NAME 'DEVAW/CDV0110(PR_GETPLHNAMW)'
PARAMETER STYLE GENERAL WITH NULLS

According to the messages that have been returned, the statement ran succesfully, and according to the iSeries Navigator the function exists with all of the correct information. However, when running the following SQL Query:

select A('L', '222001064', 123, ' ')from paddr where lapolno = '222001064'

I get the following error.

Message . . . . : A in *LIBL type *N not found.
Cause . . . . . : A in *LIBL type *N was not found. If the member name is
*ALL, the table is not partitioned. If this is an ALTER TABLE statement and
the type is *N, a constraint or partition was not found. If this is not an
ALTER TABLE statement and the type is *N, a function, procedure, trigger or
sequence object was not found.
If a function was not found, A is the service program that contains the
function. The function will not be found unless the external name and usage
name match exactly. Examine the job log for a message that gives more
details on which function name is being searched for and the name that did
not match.

I have checked that my library list has been setup correctly, and have tried variations on the parameters in both the SQL Create Function and in the sub-procedure itself. (such as adding/removing the const and using CHAR instead of Decimal)

Thanks for the help,

Alex

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