Field help (MONDAY)

Enter the day of the month (from 1 to 31) from which the monthly invoice will be generated. If the entered value is superior to the number of days included in the month, the invoice will be generated on the last day of the month. The default value of the interval is 1.

The reference invoice is considered to be the first recurring invoice. For instance:
Day of the month = 15,
Monthly interval = 1,
Accounting date of the reference invoice = January, 1st,
The next invoice will be generated February, 15th.

This field is available when the Monthly option is selected in the Recurrence pattern section.