How are temp tables FA_BALANCES_REP_GT and FA_RSV_LEDGER_REP_GT populated?

Summary:

Would like to know how these temporary tables are getting populated. Which table is it getting the fields from like amount, cost_begin_balance, source_type_code, etc for FA_BALANCES_REP_GT. For FA_RSV_LEDGER_REP_GT - amount, deprn_amount, ytd_deprn,percent, deprn_reserve, life,rate,units. Any documentation for reference? Looking at the data model, there were procedures/functions being invoked from FA_FASCOSTD_XMLP_PKG, FA_FASCOSTS_XMLP_PKG and FA_FAS400_XMLP_PKG. But since there are not accessible, we're unable to check the logic behind the population of these temp tables. Thank you.