Stored Procedures, Visual Basic 6 and LIKE clause

Hello,

I have a Visual Basic 6 program using ADO and the iSeries ODBC driver
for getting data off the iSeries (V5R2.

I use a variety of stored procedures currently with no problem, until
I tried doing a LIKE clause.

The stored procedure runs, but it returns a NULL value.  When I run
the SQL in the "run scripts" window of NAvigator, it returns data,
like it should.  I went over code a lot and I can see nothign I am
doing different from the other stored procedures I am calling.  I am
curious if anyone has any ideas.

Here is the definituion of the stored procedure I am calling:

CREATE PROCEDURE CLSDFILES.LAST_BOX ( 
        IN CRITERIA VARCHAR(50) ) 
        DYNAMIC RESULT SETS 1 
        LANGUAGE SQL 
        SPECIFIC CLSDFILES.LAST_BOX 
        NOT DETERMINISTIC 
        READS SQL DATA 
        CALLED ON NULL INPUT 
        BEGIN DECLARE C1 CURSOR WITH RETURN FOR SELECT MAX ( BOX ) AS
RETURNED FROM CLSDFILES . CLOSEDFILES WHERE BOX LIKE '%CRITERIA%' ;
OPEN C1 ; END  ;

And here is the Visual Basic code I am calling it with:

Set MyCommand = New ADODB.Command

With MyCommand
    .ActiveConnection = MyConnection
    .CommandText = "CLSDFILES.LAST_BOX"
    .CommandType = adCmdStoredProc
    .Parameters("criteria") = criteria
End With

Set rcdset = New ADODB.Recordset
With rcdset
    .CursorType = adOpenStatic
    .LockType = adLockReadOnly
    Set .Source = MyCommand
    .Open
End With

If IsNull(rcdset.Fields.Item(0).Value) Then
    MsgBox "No boxes with that search criteria."
Else
    MsgBox rcdset.Fields.Item(0).Value
End If

Also of note.  When I call the SQL directly from VB, it also works
that it is supposed to:
'sSQL = "SELECT max(BOX) FROM CLSDFILES . CLOSEDFILES WHERE BOX LIKE
'%" & criteria & "%'"
'
'Set rcdset = MyConnection.Execute(sSQL)
'
'If IsNull(rcdset.Fields.Item(0).Value) Then
'    MsgBox "No boxes with that search criteria."
'Else
'    MsgBox rcdset.Fields.Item(0).Value
'End If