APPLICANT NUMBER to be fetched MAIL ID, and Work Order related to PRPS/PROJ

Question

Hi Everyone,
I am working on Project systems module, ABAP development, 
Please help in the below issue.
In table PRPS/PROJ, ASTNA and ASTNR is applicant number and Applicant.
For the Applicant number and applicant how can I find the mail id. For this even I dont find any check table.
And how Work Order (AUFNR) table is related to PRPS and PROJ tables
Please give me the key fields to match Work Order (AUFNR) to (WBS Element) PRPS and PROJ.
What are the key fields for PRPS/PROJ   ASTNA (applicant number) field to Mail id?
Please let me know, its very urgent.
Points will be rewarded for early response.
Thanks,

Answer 1

Thanks Nimish,
SELECT pbo.*   
       ,msib.inventory_item_id   
FROM XXMEL_PVS_BSH_ORDER pbo   
,    mtl_system_items_b msib   
WHERE 1=1   
AND msib.segment1 = pbo.material   
AND msib.organization_id = 26   
AND to_char(pbo.import_batch_id) IN (select regexp_substr (txt, '[^:]+', 1, level) data
                                      from (select v_import_batch txt
                                            from dual) t
                                      CONNECT BY level <= length (txt) - length (replace (txt, ':')) + 1);
The code worked fine, I just had to change the  '[^,]+' to '[^:]+' as the parameter that comes in from APEX is a : separated value '[^:].
Thanks
Chris