How the APPL_JRNL_ID field gets populated in PS_ITEM_DST table after running AR Update process

Hi All,

I have two transactions in in Receivables.

first is maintenance and second is Payment.

when I ran the AR update process it created the Accounting entries for these two transactions and populated the APPL_JRNL_ID  as 'AR_MAINT' and 'AR_PAYMENT' respectively.

after that I  created the journals and journal generator looks these values to select the Journal generaor template.

I ran the Journal generator by giving SETID , ACCOUNTING DEFINITION only and left the Template field blank on journal generator request page.

I would like to know how system checks which template value to populate for which transaction while creating accounting entries in AR.