See FIY activity code.
The following functions are impacted by the activity code :
Financials > Utilities > Closing > Period closing
This criterion has a sizing impact on the database, because it defines the number of occurrences of the balance (debit, credit, commitment, pre-commitment balances), dimensional balance (amount, quantity, commitments in amount and quantity, pre-commitments in amount and quantity) and budget (amount, quantity) fields.