Accrual within a calendar year
In the posting image, you will find in the script column in the row with the cost account. For example, enter 2: 7,3,17xx. Always 2: first, then from which period the voucher should be expensed, then how many months the voucher should be expensed, finally the correct balance account for the prepaid cost.
Periodisering over two calendar years
In the same way as above, the system should use the correct voucher dates when you periodiser a voucher with, for example, from periods 11 and 3 months ahead.
Accrual starting in the next financial year
January is period 13. So if the invoice date is December and the invoice is January to March then the start period will be 13. 2: 13,3,17xx