Call pl-sql function with parameters All

Question

I want to call a procedure inside Discoverer; i know how to do that. I have three page elements ; when i choose specific value for each one my function work properly.
When i choose <All> like a value for any page element ; funtion doesn't run properly. We decide to display the input value when i call function; when i choose <All> value i can't see the value of the parameter. I put nvl(P1,'ABC') and i can't see the value of the parameter.
In Discovere; when we choose <All> value what is the real value or character used to call function.
Thanks
Marc

Answer 1

see my function
FUNCTION "F_SSDW_TEMPS_NET_FONCT_MIN"("P_NO_CENTRE_DISTR" IN NUMBER,
"P_ID_QUART_TRAVAIL" IN NUMBER,
"P_CODE_EQUIPEMENT" IN VARCHAR2 ,
"P_DATE_TRANSACTION" IN DATE ) RETURN VARCHAR2 IS
CURSOR CRS_TEMPS_NET_FONCT_MIN IS
SELECT SUM(NVL(EFF_REMPL.TEMPS_NET_FONCT_MIN,0))
FROM SSDW_EFF_REMPL EFF_REMPL,
SSDW_EFF_REMPL_QUART_TRAVAIL EFF_QUART
WHERE EFF_REMPL.NO_CENTRE_DISTRIBUTION = P_NO_CENTRE_DISTR
and EFF_REMPL.id_quart_travail = EFF_QUART.ID_QUART_TRAVAIL_CENTRE_DISTR
and EFF_QUART.quart_travail = P_ID_QUART_TRAVAIL
AND EFF_REMPL.CODE_EQUIPEMENT = decode(UPPER(P_CODE_EQUIPEMENT),'TOUS',EFF_REMPL.CODE_EQUIPEMENT, P_CODE_EQUIPEMENT )
AND TRUNC(EFF_REMPL.DATE_TRANSACTION) = TRUNC(P_DATE_TRANSACTION);
V_TEMPS_NET_FONCT_MIN NUMBER;
BEGIN
OPEN CRS_TEMPS_NET_FONCT_MIN;
FETCH CRS_TEMPS_NET_FONCT_MIN INTO V_TEMPS_NET_FONCT_MIN;
CLOSE CRS_TEMPS_NET_FONCT_MIN;
RETURN ('ZZ'||to_char(P_CODE_EQUIPEMENT||'ZZ');
END;
I know how to use a function inside discoverer; my question is ; for my four input parameters ( each one correspond to a page-element )
My question is ; if i decide to choose to select the value <All> for equipement code; what will be the real value passed in parameter to my function.
Like you can see in my code ; i decide to return the parameter in value.
When i select <All> the output parameter equal nothing ; i see absoltely nothing in screen ; i don't see 'ZZ'
Thanks
Marc