Only trial balance data uses the period dates on the Accounting tab (accounts and balances). Project setup uses the financial year to calculate the due date.
Onvio determines the default dates based on the current financial year end date and the specified period frequency.
Duplicate financial year end dates are not allowed in the same project.
Financial year end dates must be sequential with no skipped years.
Period dates must be sequential with no skipped dates.
If you choose a monthly, quarterly, or semi-annual period frequency and the current financial year end date falls on a calendar month end, then the period end date will be the calendar month end. If not, the period end date will be on the same date for each period.
If you choose a weekly or 13-period frequency, the period end dates are determined by using 7-day weeks, whether or not the current period end date falls on a calendar month end.