How Respond() function knows what NID to use

Question

Hi, I need to respond a notification from my application, I read a lot of message about it, but I can't see how to get the notification ID (NID) to call respond() function, I saw the following example about it:
CREATE OR REPLACE PROCEDURE "RESPOND"
( itemtype in varchar2,
itemkey in varchar2,
response in varchar2,
responder in varchar2) is
x_sqlcode NUMBER;
x_sqlerrm char(512);
nid NUMBER;
begin
select B.notification_id into nid
from owf_mgr.WF_ITEM_ACTIVITY_STATUSES_V A,
owf_mgr.WF_NOTIFICATIONS_VIEW B
where A.item_type = itemtype
and A.item_key = itemkey
and A.ACTIVITY_STATUS_CODE = 'NOTIFIED'
and A.NOTIFICATION_ID = B.GROUP_ID
and B.RECIPIENT_ROLE = responder;
dbms_output.put_line('NID='||nid || ' RESPONSE='||response );
owf_mgr.wf_notification.setAttrText(nid, 'RESULT', response);
owf_mgr.wf_notification.respond(nid,null,responder);
EXCEPTION
When others then
x_sqlcode := sqlcode;
x_sqlerrm := sqlerrm;
DBMS_OUTPUT.PUT_LINE ('Error #: ' || x_sqlcode);
DBMS_OUTPUT.PUT_LINE (SUBSTR(1,70,x_sqlerrm));
end RESPOND;
but whats happend when the SELECT result is 2 nid's, because this workflow is waiting for 2 different notifications (from 2 different activities) at the same time ...
How I know what NID use?
how can I to distinguish both NID's?

Answer 1

Typically you want to replicate in your code what SAP is doing in theirs... I find the easiest way to achieve this is to turn on debugging (/h) and run the standard SAP transaction, and set Breakpoint > At Statement > Authority-Check and see what gets triggered... then you can be pretty sure you are checking the same objects, fields, and values.
Jonathan