Poltergeist in my code?... ORA-06502: PLSQL: Numeric or value error

Question

Hi all!
I am experiencing a very strange problem,
i have the following code:
BEGIN
INSERT INTO BD_SESSION_GROUP
(CDSESION, NM_ANO, CD_CENTRO, CDGRUPO, FCSESION, ITREALIZADA)
VALUES (:DATOS.CDSESION,
:GLOBAL.CURSO_ACADEMICO,
:GLOBAL.COD_CENTRO,
:DATOS.CDGRUPO,
:DATOS.FECHA_EVAL,
REALIZADA
EXCEPTION
WHEN DUP_VAL_ON_INDEX THEN
BEGIN
     message('*1');
     message('*2');
     message('*3');          
UPDATE BD_SESSION_GROUP
SET ITREALIZADA = REALIZADA,
FCSESION = :DATOS.FECHA_EVAL
WHERE NM_ANO = :GLOBAL.CURSO_ACADEMICO
AND CDSESION = :DATOS.CDSESION
AND CD_CENTRO = :GLOBAL.COD_CENTRO
AND CDGRUPO = :DATOS.CDGRUPO;
-- GO_ITEM('DATOS.IMPRIMIR');
EXCEPTION
WHEN OTHERS THEN
MENSAJE (SQLERRM || ' No se ha Podido Actualizar BD_SESSION_GROUP');
END;
WHEN OTHERS THEN
MENSAJE (SQLERRM || ' No se ha Podido Insertar en BD_SESSION_GROUP');
END;
I have checked that it enters in the WHEN DUP_VAL_ON_INDEX exception, and it shows the code
message('*1') and then message('*2');
this is correct, but the problem is that it doesn't show message('*3');
In fact, it shows the error "ORA-06502: PLSQL: Numeric or value error".
And more, i have checked that it doesn't matter what code you put above UPDATE BD_SESSION_GROUP...
it always crashes with the same error...
it don't really know what to do, because i have tryied using synchronize...
If someone can help me, it would be very apreciated,
thx in advance!!!

Answer 1

Given the message procedure and the mention of "synchronize" I'm assuming this is code from an Oracle Form. You might want to post this in the Forms forum as it could be more of a Forms question than a PL/SQL question.
Where are you seeing the error? On the message line? Do you have ON-MESSAGE or ON-ERROR triggers?