Issues with the Radio Group and interactive report

Question

Hi,
I have an interactive report that shows customer names and associated revenues... I want my users to be able to filter customer list by Province and by City in a way that when the user select a province then only associated cities show up (driven by a table)... for the filtration I am using 2 Radio Group items (one for Provinces and the other one for Cities)
Everything is working fine, except for the fact that when I select a province (let's say Prov A) and then select a city (let's say City A1) and again when I select another Province (let's say Prov B) I get the list of all cities associated to Prov B + city A1... Not sure why my previous selection of City is showing up with the list of new cities when I change the province... I SHOULD BE ABLE TO REST ALL CITIES WHEN A NEW PROVINCE IS SELECTED
here is the code
For interactive report
select     CUSTOMER_NAME,
     SUM(YTD) AS YTD
from     T_TABLEA
where
(PROVINCE=
CASE
when :P2_PROV = 'All' THEN PROVINCE
ELSE :P2_PROV
END
and
(CITY=
CASE
when :P2_CITY = 'All' THEN CITY
ELSE :P2_CITY
END
GROUP BY CUSTOMER_NAME
For Province Radio Group I am using a static list:
STATIC2:All;All,Alberta;AB,Ontario;ON,Quebec;PQ,British Columbia;BC
For City, I am using a dynamic list using following code:
select 'All', 'All' return from dual
union
select distinct INITCAP(CITY) display_value, CITY return_value
from T_TABLEA
where
Province = :P2_PROV
order by 1
Thanks

Answer 1

Check the session state of items P2_PROV and *:P2_CITY* when the issue occurs and run the LOV query separately with the session state values.
If that too fetches it wrongly, then you would need to change your query.