R11 - Relationship between GL tables and Cost tables (Drilldown)

 Hi, all.

My company is on version 11.5.10.2

I must develop a report about the general ledger journal completing it with the source information from each journal.

I am facing some problems to find the relationship between the tables gl_je_lines/gl_interface and cst_ae_lines, to this relation i am using the column gl_sl_link_id, but  this id is not unique and query i getting duplicate rows.

My query:

select *

  from gl_interface gi

     , cst_ae_lines cal

 where gi.set_of_books_id = 204

   and gi.user_je_source_name = 'Periodic Inventory'

   and gi.gl_sl_link_id = cal.gl_sl_link_id