Field help (INVCNDTYP)

 Select the scheduled invoice type: Fixed percentage or Frequency.
Once the invoicing element is used on a sales order, the scheduled invoice type can no longer be modified.

• When the schedule is of the Frequency type, the scheduled invoice amount is calculated by dividing the overall amount by the number of scheduled invoices.
  In this case, you must enter the information related to periodicity.
• When the schedule is of the Fixed percentage type, the amount of each scheduled invoice is calculated by applying the specified percentage to the overall amount.
  In this case, the schedule information are to be entered in the management grid.