The SysID value in the GLJournal  and GLJourHis table has a single digit alpha value.  The values are added to the journal based on the process that create them:
P = Entries from payables,
G = Gifts & Stock & Pledges,
C = Fees & Allocations&Entries,
L = Manual and Recurring,
I =  Interfund Entries & GL Import,
R = Rebalacing,
S = Sync