Help wanted to locate a number sequence

Hi everyone, 

I am looking at  [GeneralJournalEntry] table , there is an unique index based on 3 fields: [JournalNumber] / [FiscalCalendarYear] / [Ledger]

 And, when I use the following SQL:

select JournalNumber, FiscalCalendarYear, Ledger, * from GeneralJournalEntry

I can see that JournalNumber is picking up an number sequence, the pattern is companyID-######,  but I cannot find the place where this number sequence is defined, I tried the General Ledger module, go to the parameters form, but didn't find a good match.        Can anyone offer some clue to find it out? 

Thank you,

Kwen