Create single-year invoice schedules for subscriptions with varying start and end dates, generating invoices on custom dates within the first year.

1. Activate the Annual List Price settings .
2. Create four recurring product rate plan charges with the Flat Fee Pricing charge model.
3. Create and activate an order with four subscriptions to the four charges, with the total amount of $70,200.00 and the same term of 12 months.

   Subscription number	Charge number	Amount	List price base	Billing period
   S1	C1	$36,900.00	Per Year	Annual
   S2	C2	$21,500.00	Per Year	Annual
   S3	C3	$11,000.00	Per Year	Annual
   S4	C4	$800.00	Per Year	Annual

4. On the order details page, create an invoice schedule with three invoice schedule items,
   1. Invoice schedule item 1: Set the invoice date to 02/04/2021 in the On field and billing amount to 50000 in the Bill field.
   2. Invoice schedule item 2: Set the invoice date to 05/01/2021 in the On field and billing amount to 10000 in the Bill field.
   3. Invoice schedule item 3: Set the invoice date to 09/16/2021 in the On field and billing amount to 9150 in the Bill field.

   After the invoice schedule is created, three invoices in Draft status are automatically generated on the scheduled dates with the specified billed amount.

   The first invoice with invoice number INV001 is automatically generated on 4 February 2021 with the total amount of $50,000.00. The following table lists the amount that is proportionally distributed to each subscription, and the service period of each invoice item.

   Invoice item	Subscription number	Charge number	Service start date	Service end date	Amount	Total Amount
   Invoice item 1	S1	C1	01/01/2021	11/09/2021	$31,592.47	$50,000.00
   Invoice item 2	S2	C2	01/01/2021	11/09/2021	$18,407.53

   The amount displayed in the Amount column for each invoice item is calculated based on the following formula:

   (Billed invoice amount ÷ Total price) × Selling price

   For example, the amount for the first charge line item in the first generated invoice is $26,282.05, which is calculated based on the formula of (50000÷(36900+21500))×36900 and rounded based on the default rounding rule specified for the corresponding account.

   The service period of each invoice item is determined by the charge amount that is billed in the invoice, calculated based on the following formula:

   (Invoice item amount ÷ Selling price) × 12 months

   For example, the proportion of months for the first charge line item in the first generated invoice is calculated based on the formula of (31,592.47÷36900)×12 months. The calculation result is 10.274 months, indicating that the service period of 10 months plus 8.22 days. A portion of the day 9 November 2021 is consumed by the first invoice. Therefore, the service end date is 9 November 2021 for the first charge line item and other items in the same invoice.

   On 1 May 2021, the second invoice with invoice number INV002 is generated with the total amount of $10,000.00. The following table lists the amount that is proportionally distributed to each subscription, and the service period of each invoice item.

   Invoice item	Subscription number	Charge number	Service start date	Service end date	Amount	Total Amount
   Invoice item 1	S1	C1	11/09/2021	12/31/2021	$5,307.53	$10,000.00
   Invoice item 2	S2	C2	11/09/2021	12/31/2021	$3,092.47
   Invoice item 3	S3	C3	02/01/2021	03/04/2021	$1600.00

   On 16 September 2021, the third invoice with invoice number INV003 is generated with the total amount of $9,150.00. The following table lists the amount that is proportionally distributed to each subscription, and the service period of each invoice item.

   Invoice item	Subscription number	Charge number	Service start date	Service end date	Amount	Total Amount
   Invoice item 1	S3	C3	03/04/2021	12/31/2021	$8,483.33	$9,150.00
   Invoice item 2	S4	C4	03/01/2021	12/31/2021	$666.67