Strange condition while trying to get the contact information (EBS) - oracle

Question

I dont know how to get all the contact information that is stored in HZ_PARTIES.
We have HZ_PARTIES AND HZ_PARTY_SITES, both have contact information, right?.
I want to obtain the information from HZ_PARTIES.
The problem is that my query is not working properly, it does not retrieve the information that i want. If i use this query:
SELECT
hp.party_name
, hca.account_number
, hcp.phone_number
, hcp.email_address
FROM apps.hz_cust_accounts hca
INNER JOIN apps.hz_cust_acct_sites_all hcas ON hca.cust_account_id = hcas.cust_account_id
INNER JOIN apps.hz_party_site hps ON hcas.party_site_id = hps.party_site_id
INNER JOIN apps.hz_locations hl ON hps.location_id = hl.location_id
INNER JOIN apps.hz_parties hp ON hps.party_id = hp.party_id
LEFT JOIN (
SELECT
owner_table_id
, max(case when contact_point_type = 'PHONE' then phone_number end) phone_number
, max(case when contact_point_type = 'EMAIL' then email_address end) email_address
FROM hz_contact_points
WHERE status = 'A'
AND primary_flag = 'Y'
AND owner_table_name = 'HZ_PARTIES'
AND contact_point_type IN ('EMAIL','PHONE')
GROUP BY
owner_table_id
) hcp ON hcas.party_site_id = hcp.owner_table_id
WHERE hcas.status = 'A'
AND hps.status = 'A'
AND hca.status = 'A'
--AND hca.account_number = 'account_number'
;
DO NOTE that i am using this condition:
hcp ON hcas.party_site_id = hcp.owner_table_id
But this query IS NOT working properly because if i want to find all the contact information for a specific account number, it should return an email but instead it returns NULL
The fact is if i put this another condition in exchange for the previous one:
hcp ON hcas.party_site_id = hps.party_site_id
It returns several results for a single account_number, everything is wrong BUT it DOES show the email that i am looking for.
What is going on here?
Could you please help me to solve this?
PS: Everytime that a customers is created, this PROCEDURE is executed:
https://www.codepile.net/pile/9nzMKy4D

Answer 1

As I know HZ_PARTIES = HZ_PARTY_SITES this is one to many relation. So HZ_PARTY_SITES can contain e.g. address "bill to", "ship to" etc.
First of all, check in EBS how many sites the customer has.
I also recommend you page http://etrm.oracle.com/pls/etrm/etrm_search.search. You can check the relation between the EBS's tables there.
enter image description here
As you can see, the relation between hcp ON hcas.party_site_id = hcp.owner_table_id
not exists.