APEX as Partner APP in SSO - Post Authentication Process

Question

I am trying to get APEX to work as Partner APP with SSO. It's almost working but a vitol piece doesn't cooperate.
In my old authentication scheme (built-apex) I have a Post-Authentication Process (see below) that needs to set my page 0 items. When I put this into my new authentication scheme for SSO and try to log-in, I get a blank screen.
If i take it out, my screen displays fine, but my page 0 items are not set with the correct values. What am I missing?
DECLARE CURSOR get_user_defaults IS
select B.fk_school, B.year, B.pk_id,
nvl(A.user_type,'N') user_type
from "#OWNER#".sis_user_roles B, "#OWNER#".sis_user A
where A.user_name = :APP_USER and
B.fk_sis_user = A.pk_id
order by decode(B.default_role,'Y',1,2);
BEGIN
FOR user_defaults_loop in get_user_defaults LOOP
:P0_LOGIN_SCHOOL := user_defaults_loop.fk_school;
:P0_LOGIN_SCHOOL_YEAR := user_defaults_loop.year;
:P0_LOGIN_ROLE := user_defaults_loop.pk_id;
:P0_USER_TYPE := user_defaults_loop.user_type;
EXIT;
END LOOP;
END;

Answer 1

not sure what the problem is. Are you sure that :app_user is set already?
However it looks as if you get an error (might result in blank screen) during your process.
btw: the pL/sqkl block could be rewritten into a single sql select without any loop.
BEGIN
  SELECT fk_school, year, pk_id, user_type
  INTO  :P0_LOGIN_SCHOOL, :P0_LOGIN_SCHOOL_YEAR, :P0_LOGIN_ROLE, :P0_USER_TYPE
  FROM ( 
    select B.fk_school, B.year, B.pk_id,
    nvl(A.user_type,'N') user_type, rownum rn
    from "#OWNER#".sis_user_roles B
        , "#OWNER#".sis_user A
    where A.user_name = :APP_USER
    and B.fk_sis_user = A.pk_id
    order by decode(B.default_role,'Y',1,2)
  where rn <= 1
exception
  when no_data_found then
     raise_application_error(-20001,'User "'|| :APP_USER ||'" not found!');
END;