1) use Personalize function to show the field "Prepayment %" to Sales Lines and then enter the Prepayment % into the line which is needed to calculate the prepayment amount.
2) Select action "Preview Prepmt. Invoice Posting to preview the prepayment amount
3) In the "preview positing" page, check the prepayment amount. If this is expected, post the prepayment invoice.
Go to step 4 if you want to adjust the prepayment amount
4) Select action "Statistics"
Change the Prepmt. Amount.
For example the original prepayment amount calculated by system is 376,949.63, however, you want to issue the prepayment invoice for 376,950.00
Replete step 3. Preview the positing then post if the amount is expected.
