Calling Stored Procedures

I'm executing a stored procedure and getting the 
SQL0440N No authorized routine named 
"AMROBI2.CREATEAIMCONNECTION" of type "PROCEDURE 
" having compatible arguments was found.

The schema exists, the stored procedure exists, the user executing the
procedure has execute permissions on the procedure and also has
insert, update, delete rights on the table being accessed in the
stored procedure. I'm sending in the correct number of input
parameters.

I'm running Version 8, FixPak 3 on Windows.

Here's the stored procedure body (pretty basic):
CREATE PROCEDURE AMROBI2.CreateAIMConnection (IN decCHANNELSESSIONID
DECIMAL(12,0),
IN strBUSINESSLINE VARCHAR(24),
IN strBRANCHID VARCHAR(24),
OUT decAIMCONNECTIONID DECIMAL(12,0))
------------------------------------------------------------------------
-- SQL Stored Procedure
------------------------------------------------------------------------
LANGUAGE SQL
RESULT SETS 1
P1: BEGIN
INSERT INTO AMROBI2.AIMCONNECTION (ChannelSessionID, BusinessLine,
BranchID, StartDateTime)
VALUES
(decCHANNELSESSIONID, strBUSINESSLINE, strBRANCHID, CURRENT
TIMESTAMP);
SET decAIMCONNECTIONID = IDENTITY_VAL_LOCAL();
END P1

Here's how I'm calling it:

CALL AMROBI2.CREATEAIMCONNECTION (5, 'TEST', 'TEST');

What gives????

...a quick aside:

The proc runs fine if I run it through the Development Center.